In my experience you can only get refurbished modules in the parts store -such an important part I wouldn't want to get a re-built one. I would go straight to GM. But first, have you thought of putting on a new idle air control sensor? My car sat for 10 years in this old guys garage (that's why it's so perdy

) without being started and that's all it needed post tune-up. The only other thing you should worry about is rust in the coolant system. I've done 5 flushes and I can't have new glycol in for more than a day b4 it turns brown! lol