FYI: sorry about posting so late about this, but the problem turned out to be a leak in the pcv valve hose. replaced the hose and valve and all was well... Guess its just the simple things sometimes. Too bad I never checked this before I spent over $200 at the dealership

That is one big vacuum leak.

Glad you got it fixed. And thanks for posting the solution, it makes it easier for the next guy!

These cars sometimes blow the hose off the PCV which is why I put clamps on my Vin C motors that I maintain.

Yeah, that PCV valve can be quite tempermental. Mine blew off too. Bit of silicone fixed it..

Never thought of a clamp.. how would that work? pics?

I just used the standard spring type vacume hose clamp.

I had this exact symptom with a 90 SSE. Would not idle, but it would start and run fine. Anytime you would let it idle, it would just die.

Drove me nuts. Finally traced it down to a bad connection on the battery terminal. Cleaned up the battery terminals and problem disappeared. When it showed up again a year later, cleaned the battery terminals again, and it disappeared again.

I also had some wierd ECM related problems on a GM diesel that were resolved by cleaning the battery ground connections. Now I always clean battery and ground connections first.

Thanks for the tip, Paul.

This started for me last week. Cleaning the terminals worked for me. This forum has saved my butt again.