Need some help with my 2000 GTP. A couple weeks ago I replaced most of my gaskets. Did the lim, plenum, valve covers, and throttle body gaskets. Ran the car lightly for a hundred miles or so and changed the oil again.

Now that everything was done I ran some Seafoam in it and had some fun on the freeway. It ran better than it ever had. Had plenty of power and gas mileage seemed to go up also. I had it parked for a couple days and now it has no power in boost.

The car drives perfectly fine with just moderate throttle but as soon as boost starts to show on the DIC it just loses power completely. I've check all of the vacuum lines, the pcv valve, all wire connectors, and pulled a couple plugs from the front and everything looks fine. The car hasn't thrown any codes so have no idea where else to look, any suggestions? Thanks