Question about 1991 GMC K2500

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92 chevy truck 5.7 idle revs up and down high emissions

Does not smoke ,changed plugs,wires,rotor,checked firing order,rebuilt tbi, injectors ? changed out with used- same problem.no engine light comes on just goes from 300 to 1100 rpm in park levels off ocassionally. smog test wont pass in high or low rpm

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  • Anonymous May 11, 2010

    did u check egr valve,is truck running rough thru out driving range

  • Anonymous Mar 15, 2014

    the check engine light does not come on. the truck idles good and always passes smog

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  • 71 Answers

Sounds like a vacuum leak check hoses and manifold

Posted on Mar 28, 2009

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