Dead spot on hard acceleration

cadryder

Registered User
Just wondering if maybe some you guys could help me out. The car has good, solid acceleration until about half throttle, after that, if you floor it, its just empty. The RPM's go down to idling speed and the engine knocks and sputters. The boost seems to be okay though, so I dont think it has anything to do with the supercharger. I really want to get this figured out, the car used to be so quick and it just sucks driving it this way, no fun at all. By the way, it has fresh headgaskets too.
 
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