I Thought I had the problem fixed when I cleaned the IAC and the orifice but I was wrong. It did improve the situation but didn't cure it.
When I idle my Deville in the driveway and the temp needle reaches halfway point it begins to idle rough then stalls. I took it for a drive which was borderline dangerous. The car kept stalling. I had to hold the gas to the floor and crank the engine til it started.
When sitting in the driveway if I let it sit a minute it will fire right up only to stall again a minute later. The prior owner said he changed both crank position sensors and there are no vacuum leaks. There's no check engine light or codes. I have recently changed the battery if that will do anything like causing the car to need to need to relearn idle parameters.
Any help will be greatly appreciated this car is driving me crazy and was running well until recently when I began to have battery trouble.

 

Someone please help me. I took the car for a ride because I read to take the car for a ride for a couple miles after cleaning the IAC. It wouldn't stay running and I ended up in traffic, and almost caused an accident. There has to be someone out there who can help me. Thanks.