My 94 Honda civic idles very rough in gear. If I shift to neutral, smooths out? on 1994 Honda Civic

In gear, it idles very roughly, sometimes it will rev up and down. If I shift into neutral, it will immediately smooth out

by in Bellingham, WA on September 25, 2013
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2 answers
ANSWER by , September 26, 2013
check your Iac valve and for vacuum leaks
ANSWER by , September 26, 2013
agree with goodguy also ck for misfires