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I have bank 1 and 2 lean codes p0171 p0174. i have cleaned the maf twice and changed the fuel filter. i checked fuel pressure and it was good and i fixed one small vacuum leak cleaned pcv and checked for other leaks. took it to get looked at and they said i need a throttle body gasket and new...

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...