99 P71 Stalling

I have a 99' P71 and its constantly stalling. Usually it is in the morning or after it has been sitting for some time. I used fuel injector cleaner twice and used some carb cleaner and it hasn't cured the problem. Does anyone have any suggestions or ideas as to what this problem is?
Thank you.

Arte you talking about when you first start it with a cold engine? Starts and dies, starts and dies?? If you put foot on gas pedal, does it run then? If yes, replace the Idle Speed Control Motor.

Yes, that's exactly what I'm talking about. Is replacing the Idle Speed Control Motor a big project?
Thanks!

It is a simple repair to do. There is one electrical connection, one hose, and 2 8 mm bolts to remove. It Is located almost center of the engine behind the throttle body. Here is a picture, yours may vary in looks, but it is same procedure. There also may be a gasket that you will need. SOme had gaskets and some didn't.

http://usera.imagecave.com/way2old/idlemotor.jpg

Thanks alot!!!