I have a 1993 Mustang GT 5.0 I've been having issues with my car since I bought it in November but it has steadily gotten worse.. I thought it was the clutch slipping since the motor revs up the car moves forward good but not hard bit before you say its the clutch. Read the hole thing.. the RPM don't spike up like when u bump the clutch pedel in... if you revs it up and dump the clutch it will spin the tires. But if you hold you foot to the floor about 2500 rpm the motor sounds different... if you only use 3/4 throttle the car pulls hard as hell the moment you go full throttle the sound of the motor changes and it seems to surge.. I thought Mabel the fuel filter was. Dirty so I change it and the fuel I poured out looked really dirty but it doesn't run any better just worse... but I've never had it die on me or stall? Any help or ideas would be awesome thanks..... if its the fuel pump what is the best brand out there and should I get a new regulator?