Have a 07 Ram 1500 with 4.7, at full operating temp with no air on idle will drop to 500 RPM at stop light and idle rough. Won't do it when it is below 45 degrees or with air on. Dealer has put new CPU and throtle body on and run all kinds of test. Anyone with any info?

 

mine does it too. I just shift into neutral and the rpms go back up to 600-650. It's probably the throttle position sensor, seems to be a common problem with 4.7 engines.

 

Might be a bit soon, but check the throttle body. Do you KNOW they replaced it, or did they just say they did. If it's dirty, the idle will be abnormal. All sortsa possibilities -- make sure the plug wires are secure.