Fixed the problem. Pulled off the TB again tonight and removed the IAC. It was completely dirty from the 50K miles put on the car running an EGR valve and recirculating breather lines. I thoroughly cleaned it with RC electric motor cleaner and reinstalled it. Then, based on Tims recommendation, I set the TB spring (MP TB) to the tighter setting. Put it all back together, adjusted the idle stop screw, and now it idles perfectly at 800 RPM's and also idles correctly when coasting to a stop.

Thanks for the help guys!