The throttle is not sealed properly.

The throttle should be cleaned for the following reasons:

1. Due to the long-term use of the throttle, there are many impurities in the gasoline, which leads to the untidy seal of the throttle.

2. The sensor of throttle position is loose, which leads to unstable idle speed and jitter of throttle.

3. There are many sensors acting on the accelerator, and the failure of sensors and actuators will lead to the failure light.