Posted on Mar 21, 2009

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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

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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Anonymous

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Posted on Mar 28, 2009

Anonymous

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Sounds like a vacuum leak check hoses and manifold

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