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Q: hard jerk at low and higher speeds on 2002 Saturn SC2

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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I'm thinking ignition system problems. Check the plugs, and the sparkplug boots for integrity.
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I would like to know the answer 2002 sc2 new clutch egr valve temp sensor throttle pos sensor fuel pump and pressure regulator all new plugs wires and coil pack when first start car runs fine soon as it warm jerks after shift gear after going thru the gears its smooth just as long as you don't accelerate
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