Question about 2002 GMC Sierra

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Engine knocking When idling I feel the engine start to miss. Its okay when driving though. 136,00 miles.

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I made an appointment with a service station, which I would have had to do anyway since I do not service my own vehicle. I think the trouble is either a bad sparkplug, ignition wire or poor gasoline or a combination of one or more of those things.

Posted on Jul 22, 2008

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