If one cylinder does not work at Wujiang Isuzu idle speed, the oil supply is normal.

The main reason is that there is something wrong with the idle speed control valve of your engine, or the throttle of your engine is broken. Generally, you need to pay attention to check the idle speed. The control valve also has a throttle valve. For example, the throttle of the engine is easy to deposit carbon, and the engine is normal without idle throttle. So you can clean the idle valve and throttle first. If it still doesn't work after cleaning, you should consider replacing the throttle valve or idle valve.