Question about 1994 GMC Jimmy

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I have a 1994 gmc jimmy and the check engine light has just come on.the engine surges when im idling but its fine when driving at normal speeds what should i look at??

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I would be looking for a leak in the exhaust system, ahead of the O2 sensor. It doesn't have to be a very big leak, you probably don't hear it or maybe a little. It will let air in and screw up the readings in the computer thus the surging. Hope this helps.

Posted on Jun 01, 2010

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