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Scotty Kilmer, a veteran mechanic with 46 years of experience and cult following on KZfaq, explains how to change the spark plugs in your car. /// YourMechanic.com offers mobile car repair in over 700 U.S. cities. Repairs, maintenance, and diagnostics -- our certified mobile mechanics can do it all at your home or office. Get a fast and free quote at www.yourmechani....