This is how I reset mine and it worked perfect... Do a search and you'll see my 50 posts about IAC crap.

Phase 1
-Unplugged IAC
-take IAC off throttle body
-note: some people will argue this is not right, but I have done it and read it in many other posts. Pull out IAC plunger (with your hands, -not to hard) until it brings up and wont pull out any furthur.
-clean it with carb cleaner/intake cleaner
-place the plunger back in the hole untill it brings up in the By pass canal (i made that term up)
-slowly force the IAC motor towards the TB until the they are snug and the O-Ring (get a new one if possible) is squat nicely.
-put your screws back in to tourque spec (haha)
-start the car

One of three things will happen now,
a)the car will stall
b)the car will rev very high (how high? it depends)
c)it will work perfect

If A Occurs
- remove IAC
- very gently push the IAC plunger back into the motor itself (1/64")
- put it all back together
- start the car

If B Occurs repeat PHASE 1

Once it is to the place where the car idles perfect turn it off un-plug the battery, and wait +15 mins. Reconnect the IAC Wire, reconnect you battery and give it a whirl.

I did this 4 months ago and the car has idled and worked perfet since.

Brent