ok heres the problem..... accelerating full throttle from 1st and 2nd is good... but when i shift to 3rd full throttle.. car boggs bad.. shakes the whole car.. so bad i have to let off the gas or shift gears..... it also happens on the freeway also.. when i downshift to 3rd... wut can be the problem???

new plugs and wires
new cap and rotor
just changed the injectors
aem feul rail wit fpr set at 40 psi

anybody??

 

seems like there's a problem with the drivetrain: clutch, flywheel, pressure plate, tranny, axles