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Re: Grand AM: Random Misfire Error Code & Catalytic Converter Gets Hot
If you lay into it from a dead stop, and it doesn't accelerate or shift, and revs out around 3000, but if you LIGHTLY ACCELERATE FROM A DEAD STOP AND IT SHIFTS AND IT SLOWLY GETS UP TO SPEED, that is usually a plugged exhaust....
As for the P0300, can you feel the misfire? Does your CE light flash?
You replaced the cat? Use OEM or one of those mini replacements?
Misfires on this engine, are usually caused by the ignition tower, the coil(s), or the ignition module.....more often than not, it's the tower....
Also have you checked the vac line to the fuel pressure regulator for fuel?
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