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