Why does the engine speed suddenly increase when in neutral?

[MacRebecca]

The reason for the sudden increase in engine speed when in neutral is: There may be an issue with the vehicle's throttle body. The throttle body has some connectors and sensors. If these connectors have poor contact or the sensors malfunction, it can cause the engine speed to suddenly increase when the vehicle is in neutral. For automatic transmission vehicles, it is not advisable to stay in neutral for extended periods while driving. This is because when the vehicle is coasting in neutral, the connection between the engine and the drive wheels is lost. The car moves forward by its own inertia, and in case of an emergency requiring braking, all braking force must be provided solely by the brakes, which can easily lead to accidents. When coasting with the gear engaged, the engine itself provides a certain amount of braking effect, and combined with the brakes, the vehicle's braking distance is shortened.