What is the reason for the engine jitter when the idle speed of Tiggo 3 is low?

There are many reasons for engine jitter caused by idle speed of Tiggo 3: the spark plug is not easy to use, the vacuum tube leaks, the throttle position sensor fails, the throttle opening is abnormal, the idle stepping motor fails, the idle control valve fails, and the air intake system leaks. Under normal circumstances, the driving computer will set the idle speed value of the engine. When the value is within the normal range or below a certain range, the computer will automatically adjust it, but when the value is below the control range of the computer, the engine will shake. Many vehicles can adjust the idle speed through the adjusting screw on the throttle, and many vehicles can only adjust the idle speed through the idle valve, throttle, air flow meter, vacuum sensor, etc. If the idle speed is too low due to the low water temperature, it can be adjusted by checking or replacing the thermostat. Million car purchase subsidy