Random misfire no check engine light
190

Asked by GP_GTX Apr 01, 2015 at 09:28 AM about the 2000 Pontiac Grand Prix GTP

Question type: Maintenance & Repair

Changed MAFS 3x, plugs, wires, O2 sensors, TPS, AIC, MAP, COILS, ignition module,
coolant temp sensor, crank and cam sensor, catilytic converter. If I unplug the MAFS the
random misfire goes away. Also it's misfiring under a load..( drive or reverse). Good fuel
pressure. Anything helps

1 Answer
190

GP_GTX answered 9 years ago

As far as the check engine light... its throwing a malfunction indicator lamp

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