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thanks all you guys for your help I found the problem it was a plug that came unpluged from the boost bypass valve,and now all the power is back YA!!!

Thats cool to hear, I ran mine hard and it just started loosing psi I tinnk I have looked through everything all I get is 3 psi

I found it the belt is good tensioner is good found the bypass valve and it is doing exactly what you said it should be doing, moves free and in the horizontal position when engine is off , I even turned the car on to see it opperate and the rod suckes all the way in with the vacume and when I...

Thanks for the help I dont know anything about this car im usualy building small block chevys,but I like the sound of a family car sleeper.. What is the boost bypass valve and where can i find it and if i do find it how do i check it to make sure its closing??

I have a 98 regal gs it has 108000 miles and when I got it it would boost 6 psi and gradually it started dropping the psi and now I can only get 3 psi out of it and I wanted to get the pully kit but I see people say chipped pistons and stuff what do I do and can you help!!