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

by in Dennison, OH on August 03, 2012
1 answer 2 comments
ANSWER by on August 03, 2012
Poss. trail arm or bushings. Go to alignment shop they are pretty good under the car.
COMMENT by on August 04, 2012
thanks i will give that a try wat is a trail arm and where is it located
COMMENT by on August 05, 2012
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.