You may have something simple like a malfunctioing idle air control valve. If you can locate a hose connected to the IAC, try squeezing it with a pair of pliers to observe if the revs drop. If they don't, air must be getting in somewhere else.
If you have a setup that has an idle up VSV, similarly locate the hose that connects to the plenum and squeeze away.
If you are worried about damaging the hose, take the supply side off and block it with your thumb.
"She gave me a look only a mother could give a child."
Last edited by Wally : 05-13-2007 at 12:01 AM.