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RepairPal Certified shops can diagnose and repair your 2002 Chevrolet Cavalier. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
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Thanks for your response. I have a actrone autoscanner but the cat over heats to much before I can get any other reading except multiple missfire.
Starting COLD , what is map/bap sensor ? (engine off-key-on should be nearly identical) map sensor should be about .8V at idle. Once in closed loop what is STFT & LTFT? Those readings may help to start. As far as the misfire , have you pulled any plugs yet , just to see what's going on in the cylinders? Visual inspection may say a LOT!