well I just talked to the kid, and looked at his setup. We decided that pulling the vaccum line to the Booster, would eliminate that as a source of problems, and pinpoint if that was what was causing the issue.

But while we were in there, I noticed on his, there is a check valve. Well it is a white union piece with an arrow on it, and I guessed it was a check valve (one-way valve).

Maybe the kid that did the swap, reversed this.

-PHiZ