quote: "also, i only disturbed 1 sensor...the lower map sensor and the barbed dung plug? did i miss/forget something?"

Just guessing here. You may want to look a little closer here. Might need to pull the lower T-map sensor and check the O-ring.
When I had the GMTU installed, the tech didn't get the sensor seated and it was leaking around the O-ring. It would start to boost, then fall flat and go to no boost. Just a thought from my own experience.

 

2nd that..was going to suggest the same thing after reading reply...

 

I was definately going back to that area this weekend..that's the only area that I didn't re-address this week.

I've also noticed several members going for an aftermarket BOV. I was/am under the understanding that the ECM counts all the air in the system. Do the aftermarkets maintain system integrity w/o CELs? New tune? What's the benefit? Got any suggestions? Thanks guys.