Coolant flush should have nothing to do with performance. But, if it helped, it helped. Sounds like your problem is two fold. 1- The most common cause for stalling at a light in a GM product is the "idle speed control" ISC. They usually just need to be removed and cleaned. A regular can of spray carb cleaner will usually do the trick.
2- Stalling going down the road could be several things. Clogged fuel filter, ignition module, fuel pump are possible causes.
When was your last tune up?
Do you have, or have you had, a check engine light? If yes, we would need to know the stored codes and their descriptions. Please advise.
Tuesday, March 17th, 2009 AT 6:59 PM