The throttle tachometer is unstable after cleaning.

It doesn't matter, the final reason is to clean the nozzle on the throttle body. The throttle valve controls the idling acceleration of your car. It must be dirty when cleaning, just because it has adapted to the dirty state inside. If you suddenly clean the inside, the position of closing and opening will change. For example, after closing the door, there are dirty things, and after cleaning, they have changed before cleaning. It may not turn off well for a while. As long as it is not a flying car, the intensity of idle speed is unstable and the problem is not big. Just get used to it. In a question, why did you clean them up for 30 thousand kilometers? Did you break the battery cord when cleaning them? The first one is that you cut off the negative electrode of the battery, press it after a few minutes, and turn the key to the position where the instrument light is all on. This is the first step before lighting the fire. Don't strike the fire so many times, let the ECU read its data completely, and then try to strike the fire. If it is too big, try to turn off the fire several times and try to go out for a run. That's it. I hope I can help you.