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FOUND IT!!!!!!!!!! The nipple had busted off the vac canister(part number 12, the hoses were streched to tight. drilled it out and tapped a fitting in, all fixed.
I started thinking about it. inorder for it to build boost and then taper off slowly with out throwing any other codes it had to be wastegate control related. Then I realized that the only way for it to close the wastegate and then slowly open it would be a vaccum leak(since the vacuum closes the WG, causeing boost pressure to increase). if it were a solenoid issue it would likely fail completely or intermittantly. this was way too consistant. So the first place i looked when i got back to the car was the resivoirs and BOOM there it was.
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