I have a 2000 DTS that I bought about a month and a half ago. It has recently started to stall when it reaches operating temp. I'm not able to drive it this happens when it warms up in the driveway. It will start again but stalls again shortly thereafter. There are no vacuum leaks and I cleaned the IAC. There is no check engine light or codes. The prior owner said he changed both crank position sensors. Any help would be greatly appreciated.

 

Thanks for all of your help everyone. I removed the IAC again and cleaned the orifice very well and the problem was solved.