I dont know what i did...but start up the car in the mornin seem fine....idle was at 1500 to warm out...drove the car....a couple blocks away from home...and the idle started jumpin up and down from 2000-700....bak and forth...any idea to what it can be?

 

Search the forums for "Idle Problem" or "Idle bounce" It is a well documented bug in the 4th gen 'ludes Fast idle valve or coolant lines.

 

Done search....dont have an answer