I need some advice on how to fix ECM codes 171 and 174. The mustang suddenly stalls and It barely moves then after I press the gas pedal several times it starts working good again. My mechanic scanned the ECM and he gave the codes and told me that engine is running too lean on both banks! I already swapped the MAF sensor but it didnt help! when the car is running ok all the O sensors work ok too but when the car stalls none of the O-sensors work as they should! I already cleaned the Fuel injectors and replaced the fuel filter. I need some advice on how to solve this problem.:scratchchin