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Hey Roger===If you stated the kind of car and engine you had it would be easier. Just guessing, it is either the cable to the throtle body or carb hanging or the idle solonoid needing cleaning. GoodluckJoe

A sizable vacuum leak could also do that.

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โˆ™ 2012-09-24 00:13:49
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Q: What causes an engine to run at 1100rpm instead of the normal 800rpm?
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