What's wrong with Tianyu SX4? Ask the master for advice.

There are five reasons for this problem: 1: the throttle is dirty, the throttle is not properly aligned, and there is something wrong with the idle motor; Throttle position sensor plug, idle motor plug, false contact; 2. There is something wrong with the battery and the generator, the voltage is unstable, and the line connection contact is poor, which makes the voltage between the generator and the battery inconsistent; 3. The vacuum tube leaks air, mainly due to brake assist.