Question about 2004 Pontiac Grand Prix

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2004 Grand Prix....Flashing check engine light but when stops flashing when I come to a stop.

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When a GM engine light flashes it means your car is misfiring. This is a symptom of another problem. It could be loose spark plugs, a stopped up catalytic converter, etc. I would get it checked ASAP. If you wait too long you could damage your car. If your catalytic converter is stopped up your car is getting very hot EGT's (exhaust gas temps) and can mess up your motor. If it stops when you stop I would lean toward something simple though, but if you go to Advance Auto Parts, or Auto Zone they will scan the car for free. Let me know if you need anything else. Thanks.

Posted on Mar 16, 2011

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