When going down the road, if you stay steady on the pedal the car will drive smooth except for on the interstate at about 70 miles an hour then it will jerk real hard and then smooth out. If you give it a decent amount of throttle at low speeds, you get the same response. What is causing this?
hard jerk at low and higher speeds on 2002 Saturn SC2
by lamborghini742 in Kingston, TN on March 18, 2011
ANSWER by Superbob on March 19, 2011
I'm thinking ignition system problems. Check the plugs, and the sparkplug boots for integrity. If you want to find a specialist, here's a directory link for you: https://repairpal.com/directory?address=37763&car_brand_names=Saturn
ANSWER by Visitor on July 07, 2011
minw\e does the same?