Wash the throttle and change the spark plug. EPC is always on, and the speed is unstable.

Hello, this cyclist. First of all, thank you for trusting me and inviting me to answer your questions. Just after cleaning the throttle valve, ECU will temporarily not adapt to the change of intake air volume, resulting in continuous adjustment of idle speed. So the idle speed is unstable! When adjusting the oil supply, there will be conflicts, and there will be the illusion that the oil supply cannot be supplied. I suggest you do a data matching in 4 S. When the EPC light is on, it is electricity.