Question about 1999 Ford Escort
I would start by looking for a vacuum leak. You may even be able to hear the sucking sound if it is large enough, an assistant will be helpful in keeping it runnig while you look. An idle air bypass valve is also another likely culprit. But first verify no vacuum leak or intake air leak. Mass Air Flow sensor could cause it too, but is usually associated with a running issue off of idle as well.
Posted on Sep 25, 2009
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Posted on Jan 02, 2017
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