The emissions light comes on and while driving, it starts to jerk as if driving a standard transmission and not using the clutch properly. Take my foot of the gas pedal & it will stop for a few minutes - then I can accelerate no problem. Also, I could be driving about 90-110 km/hr and it will start to jerk and loose power. It is very frustrating - I changed gas and also put on a new gas cap tightening it as much as possible. I need some help.