The idle meter of Great Wall Feng Jun 5 shows the height. What's wrong?

Calibrate the low idle speed of the engine to improve fuel economy and reduce emissions; The engine control unit can adjust the actuator at any time, occasionally with slight jitter. It is easier to be detected at low idle speed; 3. The quality of fuel and the degree of carbon deposition in the intake system also have great influence on the stability of engine idling. If I can help you, please set it as the best answer, thank you!