I own a 1997 stratus 2.0 4cyl 5spd, with 2001,000 miles, when im in the gas the car is perfect. when I am running at anyspeed and just let of the gas pedal and then just lightly touch the gas again as if to maintain speed the car starts to buck. As soon as it starts and I hit the gas again, no more problem. only when you re touch the pedal to maintain speed. I have replaced the wires, plugs, throttle positioner, cam sensor..any ideas... oh yes it shows no codes??????