i have a chevy monte carlo ls with 115k miles on it. recently it has been stalling and sometimes backfires for about for the first few minutes it is running wether the engine is worm or not, then runs fine but seems to lose power from time to time. also the check engine light has came on and the codes read bad o2 sensors, which i replaced and reset the coeds and it came back on and read the same thing. i hae also replaced the plugs and plug wires, ignition coils, and mass air flow sensor. what could be the problem?
Apr 12, 2007 at 7:00 PM