I have a 96 mustang gt. it has the cobra 32 valve dohc 4.6, 5 speed, has 4.11 gears in the rear end, stage 3 racing clutch. When I giving it gas it misses out real bad. When I press the gas all way down is when it does it the most. If I eas into it, it ain't so bad. Any suggtions on what might cause this?