Hello dear team!

I¨ve been writing before about my camaro and stuffand all issues have been fixed, but right now I have problems with my 96 trans am engine, it fell like misfiring, and the exhaust smell like raw gasoline, I use my pocket scan and it gave three codes: P0171, P0174, P0400, which ID was: "System too lean left and right bank on 4 sensor systems", and "Exhaust gas recirculation flow fault".

I need yto know what to do whit because it has been affecting my perfomance and my wallet because it is drinking gas like a monster, the Car is 8 cil, i think is 5.4 engine,

I will appreciate any help,

Thanks!

What about an egr valve or o2 sensor

My guess is a stuck open EGR valve. If it smooths out at higher RPM but barely runs at idle that would be the first thing I would check with a radiator vacuum/pressure hand operated pump.

...5.7 liter...