1993 Dodge Stealth Stalling/Not starting

I bought this car a week and a half ago from a guy who said that it would stall when idling after being warm, but he would wait 10 mins and it would start back up.
A few days ago, this became very serious when it stalled for me for the first time while I was **Driving**.
I had assumed it actually just needed some cleaning where the ISC was located. So when I got it home, I took off the ISC and cleaned inside there with some carburetor cleaner and a little bit of the throttle body near the butterfly door. After letting it dry, I put it back together and tried driving it. It then stalled and became much worse. It then would not stay on for more than 2 seconds before cutting off.
After getting it home, I replaced the fuel pump and in-tank filter. It still stalled.
Today, I completely took apart the throttle body and cleaned it thoroughly.
After placing it all back together, I was able to drive it for a good 30 mins until it stalled again.
I still feel it's the ISC because 1. The engine wont rev when you turn the steering wheel 2. The a/c will only affect the rpm's for a second and then it will return back to normal and 3. When I turned the Idle screw out some, it looked like it was keeping it from stalling because the RPM's kept fluctuating when the engine was still cold.
Also: Everytime it stalls, it will stall and then won't be able to run again for a while.
One last thing: Sometimes it will turn over, but then immediately stall and other times it will last a few seconds.

If any other questions, please do not hesitate to ask. I NEED this fixed ASAP!

email:billywing@charter. Net or derdervp@yahoo. Com
please do both because I don't know which will work.