Another High Idle thread...sorry.

[agood]

I just replaced the head gasket on my 90 300SEL, and now the idle is way too high. When 1st started it runs above 3000 RPMs. If I pull the wires off the ICV, the idle drops to about 1500. But never goes below that...if I plug the ICV back in...nothing changes, it stays at 1500, but if I turn off the car, it goes back to 3000 again until I unplug the ICV.
I have been over the intake with a fine tooth comb, and since I just did the head gasket, I know it pretty well.
The car idled fine before the head gasket, just was pumping water into the oil. Oh well, at least the oil is dry now.

Any suggestions will be greatly appreciated, I have search all over and can't find a solution.