What should I do if Jetta turns up after changing the throttle?

Under normal circumstances, the throttle opening will not be very large. If the throttle opening is large, the engine will fail. For example, when the mixture is too rich, the computer will increase the throttle opening to increase the air intake. Of course, it does not rule out that the throttle itself has quality problems, and the signal transmitted by the replaced throttle is inaccurate, which leads to the above failures. You mentioned that the smell of gasoline is strong, which means that the mixture is really strong. You need to check whether the water temperature, oxygen sensor, cylinder pressure, engine load, intake pressure, gasoline pump pressure and other data related to fuel injection are normal.