One week after i got my z back after being built, the motor just shut off. I turned it back on, but if I didnt keep the revs up it owuld just shut off. I get home take a look, the bolt on the pass side top fo the plenum that holds nothing or does nothing(more of a plug i guess) was gone. I pulled my motor yesterday and what do I find today when I was looking at it? Yes that plug sitting on top of the waisgate!!