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P0171 & P0174 codes on a 1999 Ford Explorer, 4.0L OHV.
The dreaded P0171 and P0174 codes. Everything was taken apart, checked and re-checked. Only thing left was the upper and lower intake gaskets. What a job and a lot of issues but it has been accomplished. No engine codes, knock on wood, yet. Been thru the ringer on this one. Had all the problems...
