Oscillating idle problem

[artstnside]

Hopefully someone can help diagnose - Lately - on my SR, I've had a problem with my idle oscillating badly. The car runs like a champ under throttle, but at stoplights, driveway, etc... the idle oscillates from about 1500 to 2000,without fail. I've checked for vacuum leaks and I've cleaned the MAF and idle air. adjustment to the idle screw on the IACV does nothing. Can anyone point me towards something else?

Also- it's a blacktop SR. I was told its possible it could be the coolant temp sensor(ECU) acting up. So, to test this I tried to unplug it and get some kind of result..

The car wouldn't start if the sensor was unplugged prior to cranking it. However, if I started the car then unplugged it, it idled fine, about 1100 rpms (normal with my aftermarket intake manifold)..is this any indication of a problem with the sensor?

[Eikon]

If it runs well w/out the sensor, and poorly with it.. that could certainly be the issue. Coolant temp sensor is cheap right? Get a new one and see if that solves the issue.