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1998 Ford F150 Triton V8 with P0171 and P0174 lean codes that has had every part thrown at it and even the repair shop can't figure it out...
But maybe a DIY can.
See my website and download the Free DIY Diagnostics Book (during limited time only) at www.schrodingersboxqm.com!!
Part 2 is Here: • Every engine part chan...