Why is it difficult for the car to stop or the engine to shake just after cleaning the throttle?

Because the current engines are closed-loop feedback, as for the throttle, the air intake is reduced because the leaked mixture sticks to some soil. At this time, when the oxygen sensor detects it, it will give the ECU a signal to increase the throttle opening, that is to say, its opening is appropriate before washing, and it can just maintain the mixing ratio of 14.7 to 1. After washing, the opening will be too big, and if the mixture is too thin, problems will naturally occur, which is also the reason for the matching after washing.