The hypothetical reason why your car is jerking at speeds of over 55 MPH is probally due to the transmission slipping as it engages into a higher gear. If there is a hard shift of the transmission at higher speeds you may have to have the vehicle serviced soon. My car was doing this once and I had a tire out of round and ready to blow. I had the same problem. It was only when I took off at first, then when I was driving on the interstate it did it whenever I went over 55 mph and the cruise wouldn't work. I had to get the camshaft sensor replaced, and afterward I had no more problems.
One of the possible causes of a Pontiac Bonneville to jerk during acceleration is that the car needs a tune up. The engine misfiring can lead it to jerk as you accelerate.
a small evap leak would not cause your car to jerk.
would an automatic transmission car jerk when shifting after having had a transmission flush
it is cauused by over accelaration during the car is in nutrule so if you accelerate at that point the cars belt will get old and it would proably that the reason you are getting a wretel in your car when you accelerate
It would be a transmission issue, not up shifting. If the engine is in "limp mode" it will not accelerate over a set mph.
it could be a number of things. my first guess would be brakes. when you say pull off, do you mean turn off to the side of the road/make a turn. or take off/accelerate from a stop
STICKING BRAKE CALIPER
A car goes faster when you accelerate. It slows down when you brake.
There are several problems that could cause your car to jerk when slowing down. The most common cause would be a transmission problem.
What kind of car is is? When it jerk while shutting off, do you turn the key off and it sits there chugging for a second before stopping?
I don't have a car.