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fast idle

Old August 7th, 2009, 12:48 PM
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My 3500 express has developed a really fast idle after warming up, could this be a vacuum leak somewhere?
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Old August 15th, 2009, 7:36 PM
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Thumbs up fast idle

could be a vacume leak which you should be able to hear it sucking air or it may be a sticking EGR valve, I went through that one,gently press on the interior of the egr while it is running
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