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After more searching on 2 other forums I found this .... (I just had this problem, but im going to school for automotive, and i was talking to the GM teacher, and we just reflashed the pcm and the problem went away. We figured out that when you force open the throttle blade, the TAC...

Sup guys new to this site , after doing a tune up on the wifes car decided to clean the throttle body with tb cleaner and a rag since it was pretty gunky.. now when i drive the car between 30-40 mph the rpm shoots up and down 1500 -2000 rpm in random while i have my foot off the gas ?? instead...