I decided to resurect this thread rather than start a new one since it already has some info in it. I have a 1989 190e 2.6 that stumbles pretty badly when started cold, smooths-out within about 5 minutes, (@ 60-70 deg. ambient temp), then the idles hunts up to ~1500 rpm at stop lights once the car is at operating temp.

I cleaned the idle control valve and tested it with a jump wire, it clicks and the valve inside just barely moves. Is it supposed to completely close when power is applied? I want to eliminate it as a problem before going further. Also welcome any experience with the symptoms I've posted, sound like typical ICV? Thanks in advance as always.