Thanks for the response.
Well, I did some more checking of the engine by pulling the electical connector off of various sensors. After pulling off a connector I did the RPM test as in my post above and and there was no change except for when I disconected the TPS (Throttle Position Sensor). Then the RPM dropped fine, but of course a TPS trouble code appeared on my scan tool. With the TPS connector on, the scan tool reads the TPS percent just fine (linearly) as I press the gas pedal. (Did this with engine off). In otherwords the TPS test out fine, but I replaced it anyway along with the IAC too.
I still have the same problem, no change as posted above.
Any suggestions???
THANKS!!!!