I have a 99 pontiac firebird v6 throwing p0171 p0174 system lean bank 1 and 2. it has 112,000 miles. i changed spark plugs, wires, fuel filter, and injectors last year. It was getting bad mpg and i cleaned the maf and went back to normal about 2 months ago. My car runs good doesnt misfire, idle high or low, or anything but still has the codes on. if you could help me out any by what it may be it would help alot because i cant pass smog and tag with the codes on. the smog inspector did say he thinks my gas cap is going bad cause it didnt seal good on his tester. could that be something?
found vacuum leak on vacuum check valve could this be the whole problem?
found vacuum leak on vacuum check valve could this be the whole problem?