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2002 Saturn SC2 Question: hard jerk at low and higher speeds



lamborghini742, 1.9L 4 Cylinder DOHC, Kingston, TN, March 18, 2011, 23:50

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?

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