why will the back end of my car jerk when i hit the gas on 1992 Lincoln Town Car

WHEM I HIT THE GAS THE BACK OF MY CAR JERKS AND WHEN I LET OFF IT JERKS IN THE OPPOSITE DIRECTION I HAVE DONE EVERYTHING I CAN THINK OF CHANGED WHEEL BARRING NEW SHOW NEW SWAY ARM BOLTS NEW AIR BAGS I JUST CANT FIGURE IT OUT any suggestions i would apreciate

Asked by for the 1992 Lincoln Town Car
1 answer 2 comments
Poss. trail arm or bushings. Go to alignment shop they are pretty good under the car.
thanks i will give that a try wat is a trail arm and where is it located
The trailing arms are hooked to the rear axle housing to keep the diff.in TRAIL
with the car.They also keep rear axle from shifting left or right when you
accelerate or apply brakes.