high RPM studdering/hesitation

[Grechie]

hey guys, ive noticed in my 4 speed auto, in every gear but 1st that it hesitates after being up in the revs (about 4 grand ish) wen its foot flat..eg, 1st gear, can rev out to 5,500rpm in 1st(80km then auto shifts into 2 then it goes to bout 90-100km in 2nd n its make a bom bom bom bom limiter sound but the revs are still climbing) n i can put it in 3rd it will go away till 3rds reved up high...i loose torque n power, its a hestiation or a studdering of some sort , does anyone know wot can be the cause? perhaps over fueling ?? wen i check the throttle, it opens up full and it can be opened the TINIEST bit more but not that much....

wood anyone know wot the prob could be?

thanks guys
- Grechie