Believe it or not, you don't use the idle screw to set the idle. It's really more useful for adjusting the TPS, but that's another story.
Your TPS is withing range, leave it alone.
Start the engine and let it idle for a minute, and then unplug the IAC connector. What happens?
You "switched out" the IAC with a new IAC, or another used IAC? if it's used, just remove the two screws that hold it together, and clean thouroughly with pipecleaners and CRC Brakleen (green can).
Try spraying WD-40 around the throttle body gasket, and listen for a change in idle. Is there any?
Have you tried to pull any codes? KOEO and KOER? What were the results?
This won't be too tough.
Take care,
-Chris
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