WHAT CAUSES ENGINE MISFIRE, TOP 6 REASONS FOR ENGINE MISFIRE

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Күн бұрын

WHAT CAUSES ENGINE MISFIRE, TOP 6 REASONS FOR ENGINE MISFIRE
If you have engine misfire and you are trying to figure out what causes engine misfire in this video we will explain the top reasons that usually cause engine misfire and how to fix engine misfire. It is important if you have engine misfire to fix the problem as soon as possible because if engine misfire is left unfixed it could cause sever damage to your engine and catalytic converter / exhaust system. In this video we are going to demonstrate the top 6 reasons that causes engine misfire based on our experience at the garage. Engine misfire is one of the most common problems with gasoline engines and most of the times it is somethings simple such as spark plug or ignition coil causing engine misfire however, if not fixed it can damage valves, lose compression, damage oxygen sensor, catalytic converter.
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Пікірлер: 309

@AutoRepairGuys 4 жыл бұрын

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@thomasvasquez6023 Жыл бұрын

0000pppppppp

@jonathanmoflori4915 Жыл бұрын

He probabl masters more than 10 languages then your grandpa. Who give a fk about his accent, what matters is the knowledge that he has and ability to perform the work.

@goldwolf0606 3 жыл бұрын

1) spark plugs - check gaps and brand 2) ignition coils bad - replace coil 3) oil on coils - oil well gasket, clean well 4) water on coils from washing 5) water in fuel line/injectors 6) bad pcv valve

@vakerisk1576 3 жыл бұрын

Thank you 🙏

@learsisalotiv1625 3 жыл бұрын

I think I love u now 😆😘😘😍 🤣🤣

@claymanbob1 3 жыл бұрын

Thanks! Saved me 6+ minutes.

@MrMarkeboy1234 3 жыл бұрын

Mine was down to 2 faulty injectors on my tsi engine.

@billsmith7673 3 жыл бұрын

@@learsisalotiv1625 me, too

@silvialozano1131 3 жыл бұрын

Thanks so much for taking the time to help others. Bless you and your family long happy prosperous lives

@mcdonaldgc3020 3 жыл бұрын

You have a good helper

@cowcat7436 2 жыл бұрын

everytime he says "guys" take a drink.

@Dan-xx5jq 2 жыл бұрын

Thank you so much. This video helps a lot especially since you can see the parts.

@cgsulitdiagnostics8428 4 жыл бұрын

love your video, love your enthusiasm 👍👍👍👍👍

@daewonshaun1 5 ай бұрын

Great video, made it very easy to see everything clearly with the engine on the stand.

@JS-ri2rx 2 жыл бұрын

Great video. Keep them coming

@TheKlown82 3 жыл бұрын

Thanks. Keep up the good work

@davisbrewer6136 Жыл бұрын

Good job explaining the possibilities for random misfire. You possibly hit on the one thing that I was suspicious of, and that was the chance for water to leak into the coil channel at time of washing the engine. My E550 with M278 engine was running fine before I did some minor repairs around the front of the engine and washed the dirty engine with garden hose. I will look into the coils for traces of water that could be causing the random misfire. Much thanks for mentioning the possibility of water inside the coil channel.

@vin-kingsleyonianwa5483 Жыл бұрын

I surprisingly found this video very helpful

@dreamwalker3699 Жыл бұрын

Great Job on the Video Guys.

@x3trav13zox3 Жыл бұрын

Good info. Very detailed

@speedlife9564 3 жыл бұрын

Spark purcks , love the accent very good video!

@pacman7959 3 жыл бұрын

Park purks

@nicolebraxton6273 Жыл бұрын

Best explanation thank you

@Jakemott67 Жыл бұрын

Great video! Very informative , a not so common one would be a clogged catalytic converter. That will create a incomplete combustion with detonation and misfires.

@dawayaa Жыл бұрын

Interesting... I cleaned my throttle body and intake with 2 cans of throttle body cleaner and now I code for c8 misfire and have a blinking check engine.

@AlchemistAugen Жыл бұрын

@@dawayaa You removed throttle to clean it, right? Did you figure out what's going on? I need to clean mine. I changed engine and cabin air filters this week.

@motodon5686 9 ай бұрын

Great information thanks

@waimeaguyz9074 2 жыл бұрын

Thank you for sharing

@vincentdean7801 7 ай бұрын

Good advice thanks

@Engineerboy100 3 жыл бұрын

You forgot one of the main reasons, a bad or clogged fuel injector or bad fuel injector connector. Also failing fuel pump or fuel pressure regulator causing low furl pressure.

@ivanmikhaylov1103 Жыл бұрын

This is not right for MULTIPLE cylinders misfiring.

@Jackofalltradejerry 8 ай бұрын

I was listening for him to say that one of the injectors not working could cause a misfire too.

@mraby32 Жыл бұрын

Thanks I hope this helps with my 2006 Lexus GS300

@malcomlittle251 3 ай бұрын

👍 Thanks for sharing !

@trini_boi2414 Жыл бұрын

Got a code for a misfire and found out it was a cracked coil but I'm still getting a rough idle..going to drive around and see if the check engine light would come back on btw good video👏🏽👏🏽👏🏽

@LCcervantes Жыл бұрын

What's the code

@kalimanelhombreincreible865 7 ай бұрын

GOOD VIDEO !.

@alejandrosanin4739 8 ай бұрын

🔴Helpful video… thanks. Greetings from 🍁Canada

@AlfredMamuya Күн бұрын

Thanks for your sarport

@user-vs6kz4qt6v 4 жыл бұрын

Wonderful

@pabsime Жыл бұрын

Great video. You forgot to mention to stop pressure washing your engine bay if that is your cause. Bad idea. Can lead to several immediate or long term issues. Unfortunately whoever needs to hear this can't because they have taken their phone into the shower too many times and can't drive to the store to fix it either.

@loganwintry9945 10 ай бұрын

I think you guys just saved me! I have a 2004 Jeep Liberty 3.7 2WD and it shakes when idling or accelerating. It initially stopped when I swapped out the spark plugs but started again 3 weeks later. There was oil on my sparkplugs too! I had suspected a misfire but couldn't understand how because the spark plugs were new, now it all makes sense. I have now subscribed and I think you guys will be my first stop when I have questions in the future. Now I gotta see if you have a video on cleaning out the coolant system

@johnrobertpostrado614 2 жыл бұрын

What about the distributor? Could it be also that cap and rotor problem that causes misfire?

@HK-el4xv Жыл бұрын

Thank you

@jamesmullins7413 Жыл бұрын

Hi great video but you missed reason 7 and that's because oil gets on the plug or plugs resulting from worn oil rings which allow oil to come up pass the oil ring and soak your plug or plugs with oil causing a misfire,just thought that I would add that because that's what happened to my 2005 Chevy Trailblazer.

@koolbreeze6303 10 ай бұрын

Great information I have a 04 Envoy

@kalpeshkapadia4623 3 жыл бұрын

Thanks

@jonathangorwor7832 Жыл бұрын

I love this trade

@michaelhanglow5051 2 жыл бұрын

This list is not complete. Their are numerous other reasons for a misfire. But it’s a helpful start.

@miguelherrera6473 Жыл бұрын

I hade a code 0303 new plugs and coil after checking everything I didn't tighten the plugs whell code when away nawe thanks for the good videos 👍

@benkr5870 Жыл бұрын

Nice video ! how do the ecu detect a misfire ?

@whycantthisbeblank Жыл бұрын

You forgot fuel injector stuck open. Nice video - thanks.

@hazelstreet1654 2 жыл бұрын

One of my ignition coils went bad after 60k miles in my Honda, so I replaced all the coils and spark plus. It was running perfect again, until two months later. When I accelerate to about 5k rpms the engine misfires until I let off the gas. Then sometimes qt idle it will barely misfire. No check engine lights go on though. What could it be? Did I not screw in a spark plug tight enough?

@rock_0075 3 жыл бұрын

Hi, Thanks for the video, I have toyota corolla petrol 2002, one day the engine light came on and start loosing power (i had to high rev to drive the car), took to mechanic but the his computer cant read any code , not sure what else i can do. on low speed the engine light stays on but when i go high speed the engine light start fleshing and exhaust noise is a bit loud and feels like miss fire. any guess please?

@lendavidhart9710 2 жыл бұрын

Bravo

@francineharding1992 3 жыл бұрын

Can ypu reset the m8sfire on forte 2018 with out changing the coils

@bobbyfurlow1103 3 жыл бұрын

What about a bad fuel injector?

@dhowar Жыл бұрын

or broken wires to the injector.

@Eddythe_Eagle 3 жыл бұрын

I have a question. It seems the 2010 elantra may have a intake manifold leak. Car has considerable vibration at idle but drives ok. The vibration improves after the car heats up. It had been getting worse over the last 2 years. It is a steady vibration. I have a good ob2 scanner. How can i check the problem with the scanner? Plugs are ok, and I am getting no check engine light, or misfire on the scanner from a lean mixture. Thanks Ed R

@WCB9175 2 жыл бұрын

Do you have a video on How to fix code PO3200? The code is for manufacturer controlled DTC fan clutch. On 2008 750i BMW. In a part number.

@phillriley1993 Жыл бұрын

Hello, have a 2012 chevy malibu 2.4L and my issue is: I'm loosing oil but I have no leaks no smoke and no low oil pressure light. I pull the dipstick and no oil. I have to add a qt and a half in between oil changes. I think pcv valve which means I have to buy a new valve cover because it's built into the valve cover. What do you think?

@Asian_Connection 3 жыл бұрын

What do you think the issue is when I the car has slight misfiring, slow lost of coolant, smell light coolant odor, old spark plugs 180k, can overheat sometime? thanks

@travisswiggart7506 Жыл бұрын

Easy to respect this fella shit how can ya go wrong by learning from ones that don't have to be so sharing in knowledge so ya this dudez good shit

@70ciscopereira 3 жыл бұрын

I have a engine misfire po302 replace spark plugs ignition coi all 4. Still misfire on cylinder number 2, we dicided to replace all four injector. Crank again and still have the same problem. Swap ignition coil and spark plugs from other cylinder and the problem continue. I watch one of you many videos for this problem but unlikely I haven't find the problem and I think may be pcm issue. I need your suggestion what could be, or if it's a good possibility of pcm problem or harness

@samoniumuziejus 2 жыл бұрын

I got ruffly 40000 misfires on each cylinder but the car still pulls fast.. and shows no error codes, not sure if I should try fixing it =D

@sylvesterstorer1137 5 ай бұрын

Do you have any nissan v6 engine I would like to see the colour code for the wire on the sensor for the air intake

@Siz821 2 ай бұрын

How about broken Plug Lids, are they not causing misfires or jacking moves when a vehicle is in motion?

@andriesmaila4566 3 жыл бұрын

Good day. I drive 2000 BMW 330i. The vehicle started having stall movements especially poor taking off. Loosing power. The idling started going from smooth to.bad idling as if is a diesel but is a petrol. The vehicle is shaking badly when it idles. Smells fuel as if there is a leakage. Battery power live terminal gets very hot in a way that it leaves burn marks. Check engine light os on. What could be a problem with my vehicle?

@mikemillie3826 2 жыл бұрын

Did you end up fixing the car my Benz have same issues misfires engine

@briangreen8887 2 жыл бұрын

Put 1 litre of diesel in the engine oil Let the car idle for 10 min do not rev the Motor Then drain your engine oil Put fresh oil and filter Your car will run like second hand brand new again Start there then we can see

@kaelamarvin9748 2 жыл бұрын

Catalytic converter or donut gasket

@kaelamarvin9748 2 жыл бұрын

@@mikemillie3826 catalytic converter or donut gasket my guess

@js2music231 Жыл бұрын

Hi, I have a 2015 ford explorer and cylinder 2 and 6 misfire only at high ideal like around 35000 rpm and when driving at 55 mpr check engine light start flashing. I change, spark plugs, fuel injector, fuel rail ignition coil all factory parts. And still having the misfire. Do you have any suggestion for me thank you

@creatingasimplelife1869 10 ай бұрын

I have a 2012 ford fusion sport with 121k miles. Started with a lean code. I replaced all fuel injectors. Then it threw a misfire on cylinder two code. Changed out all spark plugs, coil packs, & both cam sensors. Still has a rough idle and misfires when coming to a complete stop. Took to dealership had a compression test done…has compression, spark, & gas. Next thought was timing chain. But now the other day when i went to start it..been sitting for a month or so.. it has a hole in the muffler by the air take system. Could that throw a misfire code?

@jrblaxxx2340 Жыл бұрын

The timing can be off that can cause a misfire or the pcm not good or the valve stuck.. just a few more

@RishardVanAmsterdam 2 ай бұрын

What about an ignition control module ? Does it also cause a missfire?

@eazystreet5507 2 жыл бұрын

Reason number 7 bad fuel filter. Reason number 8 vacuum leak.

@Jackofalltradejerry 8 ай бұрын

I have a 2009 honda Inspire (accord) and th the number 4 cylinder is not firing. I moved the coil to number 5 cylinder and it worked properly. I also moved the spark plug to number 5 cylinder and it worked properly. So my next test is to test the fuel injector which is my next move. So I checked the number 4 cylinder that was not firing again by taking out the spark plug to see it wet, soaking wet. However, when I move the same plug to another cylinder it is not wet.

@patrickthenomad 3 жыл бұрын

Was that a gap tool? It looked like shims not thick enough to measure spark plugs. Can you stack them?

@elwing07 3 жыл бұрын

I like it when he says guys

@martinfigueroa410 3 жыл бұрын

I have a p0301 on my chrysler 300 i ran the car threw some water about a year ago i did have water in filter but car didnot hydrolock ever since i have had that code i have change the spark plugs coils and fuel injectors problem keeps going and coming what could it be

@larrywannjr559 3 жыл бұрын

Was really hoping you had something I did not try. 2002 Nissan Altima cylinder 2 not firing. Changed spark plug, coil and injector. Also did a compression test and it just won't work. No one goes beyond that point so I am lost.

@W0mpW0mp999 Жыл бұрын

What was the issue?

@izzymabena 3 жыл бұрын

please help. I just replaced my chain on the 1zz and it restored the power n throttle response. A day later, the power is lagging n i have to double tap the accelerator to get it going... what could be the problem? My electronics like spark plugs n coil plugs are all new - please help

@user-kf7cz8gh9l 6 ай бұрын

I got a 1979 chevy van g20 can a disturbing seal on the bottom make it miss fire can u replaceit

@TheEihklusivKrossi 3 жыл бұрын

Hi Auto Repair Guys, I owned a VW Golf 1.4TSI MK6 2010 CAXA engine. I have a unresolved issue with the car. My car always throw a flashing CEL when I drag to 4.5 - 5 RPM. Lower RPM under 4 no issue. Plug in computer says P0302 cylinder 2 misfire. Swapped plug, ignition coil, injector, fault stay cylinder 2. Replace plug, ignition coil, injector on cylinder 2, replace High pressure fuel pump, high pressure valve, ECU reflash to factory mapping still fault at cylinder 2 same RPM range. Hopefully you can give some expert opinion on what to look out for next. Many thanks for your help. Regards, Syed

@craigbullock8245 3 жыл бұрын

My car is in the shop being diagnosed for a misfire. I am keen to know what the problem is. Hoping it is a spark plug or coil. Someone suggested a stuck valve caused their misfire (similar car/engine) so I am hoping it is now that.

@550Benz 2 жыл бұрын

What was the cause ? I changed my Fuel pump, coils , spark plugs and still nothing but it has improved a lot in performance

@MrSwaggnificent24 2 жыл бұрын

I had a stuck valve on a 3.6 vvt engine that caused a misfire

@MICKYSTATEN 3 ай бұрын

what about a bad knock sensor? Would that cause a misfire?

@hooberdoober576 Жыл бұрын

Change crank position sensor vid?

@danielvaher Жыл бұрын

Hi do you know what is the problem with it having a misfire when cold and a tappets noisy 3.5 v6 petrol getting a code p0303 cylinder 3 misfire. Thanks

@akashkumar9144 3 жыл бұрын

Could it be bad coil lugs

@bartokthemagnifycent7078 Жыл бұрын

Did you miss mentioning a bad injector?

@adeniyiogidiolu3713 Жыл бұрын

Can the ECU cause a misfire too?

@MrSwaggnificent24 2 жыл бұрын

Cat converter too

@SeanDIY 2 жыл бұрын

Did you mention bad lifters?

@prestonboling1427 3 жыл бұрын

is the water in your ignition coils common when you power wash your bay? i just did this any i definitely have a misfire. my cel is on blinking and my car shakes like a mofo at idle😂. what else should i check while drying the coil packs

@chrishayes5755 Жыл бұрын

i dont get why people power wash their engine bay, that shit doesnt make you paranoid? I'd be scared to destroy everything lol

@garyalford9394 2 жыл бұрын

Establish good engine compression first !

@christopherm9637 3 жыл бұрын

I have a 2013 dodge charger v6 and I had the hole tune up done brand new spark plugs and coil packs from advance auto but still reading misfire and check engine light came back on. I already changed one o2 sensor when I first got the car because of the check engine light but then a week after that the it read misfire so I got that done and it's still reading different misfires. Can anyone give me an idea of what's going on?

@Kzxo 2 жыл бұрын

For some reason I get misfires and CEL when I use off the shelf tune such as COBB. But when I go back to stock it completely goes away is that shit normal haha

@kingshanaman 19 күн бұрын

Love the accent

@jameswaugh115 2 жыл бұрын

You didnt mention the harmonic balancer shaft

@33REX90 3 күн бұрын

Can a bad oil pump cause this as well?

@totaramchandradatt 9 ай бұрын

Can a bad purge valve cause misfire ?

@realtruthseeker521 Жыл бұрын

I don’t have a engine light or code but when I come to stop sign I feel it missing like a minor jerk feeling.

@shancharan7834 2 жыл бұрын

Whole time I only listened to his accent........still better than mine

@shaun787max 3 жыл бұрын

i had someone do a spark plug job about a month ago and everything was fine, last night i had someone create a custom exhaust for me but after ten minutes my engine misfire, would it be the exhaust that caused the misfire or could it be the spark plug job from a month ago just happened to go wrong last night coincidentally

@vailinator 3 жыл бұрын

Shaun Max if your car has an O2 sensor on the exhaust it might’ve been affected with the custom job

@shaun787max 3 жыл бұрын

Update: I had a misfire, presumably because I now had more air going thru via the newly installed Xpipe , it triggered the misfire that would of happened eventually due to my already compromised ECU/CAI from a previous tune up

@IronMax418 Жыл бұрын

What about 02 sensor or Catalytic converter?

@CoreyHart13 Жыл бұрын

I'm wondering about the 02 sensor myself

@jasonyurrrr9994 2 жыл бұрын

Will the engine shake with misfires ?

@stephensherwin1530 Жыл бұрын

I have a v6 3.5 L vtec engine that I replaced the valve cover gasket, cleaned all the air intake as well as egr valve passage ways. New coil packs all around new spark plugs and new fule injectors all around but yet my engine still is only running on 4 cylinders (1&2 sound a miss) is there something else I may be forgetting? My next logical step is to step into the head and block to make sure the pistons Still have Orings and that the valves ate opening

@rmack2311 Жыл бұрын

Did you find the issue?

@stephensherwin1530 Жыл бұрын

@@rmack2311 not yet still have to pull head off

@lightworker303 Жыл бұрын

HONDA v6 have issues with piston rings sticking. They had a class action lawsuit. Buy a vcm disabler

@TomMack530 Жыл бұрын

i have new spark plugs and they all are gaped right on , new spark plug wires, and still getting misfire ,cylinder 5 misfired 1064 times, #6 misfired 334 times ,#1 misfired 357 times code PO300 ? could it be the coils?? or the injector's???

@guillermomora2169 3 жыл бұрын

I have a question my van was running good and I just changed oil filter, spark plugs and the oil and after that is missing misfire and vibrate?

@juniordelossantos392 2 жыл бұрын

What was your problem ? I just done that to my toyota altezza and it misfires badly

@dardanmilitia6654 3 жыл бұрын

that accent thickkkkkkkkkkk

@need4green268 3 жыл бұрын

Not the accent he got problem with his tongue 😅

@kamilkazmierczak2842 3 жыл бұрын

i bet his english is better then your second language

@need4green268 3 жыл бұрын

@@kamilkazmierczak2842 u sound so dumb right now bro

@rmcpeek 3 жыл бұрын

@@need4green268 are you short, unattractive, lack sexual partners, poor, smelly, no father?

@need4green268 3 жыл бұрын

@@rmcpeek no that’s what you are Jose 😂😂

@passion4vintage559 Жыл бұрын

Hi! Thank you so much for taking time to make all the videos for us. Please help me. Here is my issue. I just bought a 2003 GMC Sonoma SLS 6 cylinder Truck . The truck shakes/vibrates really bad once started. You can literally see the engine moving and shaking. It shakes throughout the drive and also appears to shake even more when at stopped light. Just yesterday afternoon, i was at a red light waiting to make a right turn onto the freeway. Once light turned green as i was pressing the gas and turning my steering reel it became hard to where i couldn’t turn it normally and literally suddenly just died on me. Thank goodness there was no other car making a right turn on the far left lane because when my truck steering reel became hard to turn the car went toward the left side. I tried few times to start car and it started and i went to the left turn trying to turn into the 7’eleven parking lot, right when i went onto the parking it died again. This time it took more times until car started again and this time when it felt as if the car is starting i gas it to help turn on. Then i drove just across to Oreilly and the worker scanned car and a code on his machine detected Cylinder 2 misfire. Purchased NEW: Spark plug wire set 6 spark plugs Replaced it on car. Still not resolved. Upon checking the MAF sensor was no good, the distributor has a line cracked on the number 2 . Went back to Oreilly: Purchased NEW * MAF Sensor *Distributor Cap & Rotor Replaced on car with those too. Again NOT Fix still showing code Cylinder 2 misfire. Issue present: 1.Shaking/vibration on car really bad and loud. 2. Check engine light comes on and off (flashing) I do not want to guess on what it is. Can someone please guide me on what to do next that can fix this. **At this moment writing this comment, i am in the car parked at Oreilly debating what to get. ***also when i moved wire on cylinder 2 to 4 and 4 to 2…it still show cylinder 2 misfire even after moving it to 4. Do i get Fuel filter?

@arctic7555 6 ай бұрын

did u ever figure out the problem?

@passion4vintage559 6 ай бұрын

@@arctic7555Hi :) yes finally after i was ready to give up! Here the info: misfire cylinder 2. All spark plug and wires was changed new, new MAF, new distributor and rotor replaced …did not fix issue. Had a mechanic diagnosis it and was told cylinder head need to resurface! Took cylinder head out, took to shop to do compression, shaved, and resurfaced the head. Had to replaced 2 rods and rocker arms cause it was bent bad, Bought new head gasket kit, a gallon coolant. Put head back on but car wouldn’t start! Why? Now have to time the distributor again! (Pain in the behind!!)…got car to TDC, distributor back on and at last!!! Car started and working fabulous EXCEPT i have a loud annoying sound! Its the exhaust! While trying to get car to work, someone stole one side of the cat. So besides that it fire up and runs. Hope that helps.

@NoloPrime 3 жыл бұрын

I have a Mercedes C250 2013. I went to change the spark plugs and I found oil in the plug well on cylinder 4. It was a little difficult to get the oil out and then I figure it out a trick. Roll up a paper towel or blue shop towel so it fits around the spark plug slide it in over the spark plug and turn it until it hits the bottom of the well. I left it there for a few minutes to absorb the oil. Repeat this a couple of times.

@itsonlyright3108 3 жыл бұрын

Bro I have the same car and my engine light is on is says c4 misfire what do I do?

@NoloPrime 3 жыл бұрын

@@itsonlyright3108 you likely have a bad valve cover gasket like I did. The gasket set isnt very expensive (about $65). Check by pulling your igjition coil closest to the front of the car (cylinder 4). If you see oil on the ignition coil your gasket is leaking and needs replaced. If there is no oil in the spark plug well or on the ignition coil you may just need plugs (gapped properly) and Ignition Coils.

@itsonlyright3108 3 жыл бұрын

Thank you bro

@robertdl07 2 жыл бұрын

Hey I have a question I have a 2007 Mercedes E350 and someone told me that my car needs computer that’s why it’s miss firing is this true

@kdunhoo7894 Жыл бұрын

My spark plugs came gap but I didn’t gap myself. I replace spark plugs. Wires but not the coil pack I did fuel injector cleaner replaced the fuel pump But only code that keeps popping up is misfiring cylinder 1/4. What could it be Should I gap all spark plugs my self

@TheXilya 7 ай бұрын

What about o2 sensor 1 upstream. That can give a misfire to the whole bank

@user-vx7cg9vk4i 11 ай бұрын

What about an air leak in a vacuum line?

@ivanmikhaylov1103 Жыл бұрын

How to check for water in fuel hoses? How to get rid of it? I have the only code P0300. When the engine is cool, the car runs as a brand new one. after about 10 minutes driving it starts jerking at acceleration. Meanwhile, the engine still runs smoothly at parking, no matter what rpm is. I have replaced spark plugs and ignition coils two times already. The problem persists. What could be a reason for absence of any other codes? Why it doesn't happen when the engine is cool?