AutoZone doesn't charge anything to read trouble codes. But I had a similar problem with an '02 V6 Camaro. Cat converter went bad. Blocked exhaust,
exhaust manifolds got hot, had engine misfire. Replaced bad converter ( honeycomb mesh was in pieces on engine side of converter). Still didn't fix misfire. Still had engine misfire, especially when engine hot and under load (running A/C, had passengers, etc.). Replaced all ignition coils, SHAZAM, trouble fixed. Computer won't tell you if coils are bad, not smart enough. Coils are dirt cheap on eBay, I am not a seller of such parts. Before I replace coils, I replaced plugs and wires, but I was pretty sure that they were good already, and I was right.
Friday, July 9th, 2010 AT 8:40 PM