Recently got my supercharged stang tuned and it ran fine for a week, then the fuel pressure dropped to like 25 and ran like crap. So I replaced the fuel pump with a new 255lph high pressure Walbro. Now the car is running better except for one problem, the car pulls really hard up to 5500 rpms with no hesitation or bucking, but as soon as I let off the gas and the rpms fall and then I go to accelerate again at like part throttle when the rpms get up to 2500 the car hesitates for a second and then its fine. So pretty much when coming out of boost and accelerating again the car stumbles for a second or two in the 2200-2500 rpm range. Any suggestions?? Thanks in advance!