Dec 13, 2020 at 1:19 PM
(Merged)
keep causing a skip or lugging code P0171
2003 FORD F-150
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Verify all information, follow manufacturer service procedures, use proper tools and safety equipment,
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honestly at this point in time, i don't like to tell people this, but I honestly think you will be better off taking it to a dealer instead of spending so much time and causing such a headache over it.