We did a scan while siting and driving. But I am thinking capture the driving data and see whats up. I think your right another scan and maybe something was missed.
JP

Make sure your scanning enhanced codes, knock retard, check the torque converter lock up, things like that.

Enhanced codes. Cool I will make sure the Medford crew is aware of that as I never even heard of that but makes sense. Good call.
JP

I started looking at this again and found the rubber vacuum fitting off the throttle body had a leak and was cracked. This is the one that also hooks up to the fuel pressure regulator. I did a temp fix with a T and hose till the GM replacement comes in next week Monday. We shall see in a day or 2 if that was the culprit.

Any vacuum leak, no mater how small is going to be a problem.

I agree Dan. The older our cars get, the more our vacuum system breaks down. Those little rubber connectors get hot, cold, hot, cold and break down. Even a minute vacuum leak can cause problems. Thankfully, most of our vacuum related things are located in the engine bay for easy accessibility.