missfire on #3

Asked by Feb 18, 2011 at 09:45 PM about the 2000 Pontiac Grand Prix GTP

Question type: Maintenance & Repair

replaced spark plugs and wires the first time the check engine light came on three months later the same light came on with the same reading   missfire on number 3.

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Check compression, and make sure you're using the correct octane rating.

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