Ghayoor

Hi i have a 2002 Gt and when the car is cold, even small amounts of gas cause the car to 'skip' and 'shudder' when the car is revving out. meaning it feels as if there are pauses in the cars power as it climbs the tachometer. it feels almost like the engine is cutting slightly and coming back to full power very quickly and very repeatedly. however, once the car warms up, the problem disappears, and only reappears when the car is floored and getting close to the redline, even when the car is warmed up. I've been told its misfiring, it has exhaust back pressure, the throttle body is choking? i honestly don't have any idea what it is and desperately need help