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Q: a 2009 - year Jetta car, the owner feels 2, 3, 4 gears to shake the throttle, clean the throttle, change the machine foot pad, but the failure is still, what is this fault? Answer: according to your description, I suggest that we check the fault code of the electronic control system first. The signal of the clutch switch of the car is bad, which causes the car (jitter), and too much carbon will cause jitter. If there is no substantial parts failure, it is recommended to clean up intake gas, intake valve rod and combustion chamber to remove faults.