Hi all pls help my car can not drive beyond the speed of 120km/h with the rev count at 30 otherwise it will jerk if u press harder and speed will gradually reduce then drive smooth again but only at that speed and it can even travel more than 1000km at a speed of 120km/h there will be no jerking unless you try to go beyond...i tried replacing the gearbox and pressure pump fuel pump but the problem is still there. a vw local dealer told me its a cam shaft position sensor. Pls any suggestions