breagles

I have a 99 GT with a vortech supercharger 14 psi aftercooled and 310 lph fuel pump and 42# injectors . but I have a problem when I accelerate hard it bogs down at around 5psi and wont go any harder . If I feather it I might get a good run but that's not giving it all it has . I've checked the complete fuel system filter , pump seals , and injectors . I had it dyno tuned and they found out it had a bad ground and a bad alternator because the voltage would drop to 11 . The fuel pump needs 13.7 to operate correctly . After all this the car runs better but it still feels like it runs out of gas or spark at 5+ psi and it falls flat on its face .Do you think it's in the dynotune or it might be something else ? Help!