car runs like crap at 2grand! please read !!

[leathal injection]

i gotta 90 GT w/the mods listed below. at 2 grand my car starts Bucking back and fourth, its really anoying me. the bucking obviously gets weaker in higher gears. but driving around town in 2nd or 3rd at 1500-2g's is driving me crazy! My head snaping BACK and FOURTH, BACK AND FOURTH !!

i ruled out my clutch, cause whe when i stuff the gas the car flys, i also checked my tranny cross member bolts, there tight. could my U-joints be the issue ? or torque box bushings ? what do u guys think, any imput would be great !

-Dave

[canukracer]

do a tps sweep, should be the middle wire then ground using volt meter watch for a break in voltage around the 2g position not running key on.

[leathal injection]

ill check that out thanks for your imput!

what should the tps voltage be at 2g's ?

[canukracer]

idle should be around 1 volt so maybe 2 volts at 2g's/// but were looking for a voltage break. 4 volts is wot