Hey so im working on my fiancés monte carlo with the 3800 in it after it warms up it starts sputtering, backfiring and eventual stalls. Ive replaced the evap purge valve, throttle position sensor, mass air flow, spark plugs and wires , and the camshaft position sensor. Any ideas what it could be.

 

Do you have a way to monitor data? Sounds like once the car warms up and goes into closed loop it is failing. You can check the oxygen sensor

 

Bear in mind I don't know much about this stuff, but I always wonder... if it's getting enough air, it getting gas? How is your fuel filter?

 

It ended up being the ignition control module

 

Good to know. I just bought an '01 SS. Was that a big job?

 

No super easy just take off the coil packs and its right under the coil packs