What is the cause of engine jitter when the car is hot?

The causes of engine jitter during hot start are: 1, blocked idle air hole, poor idle device, weak spark of spark plugs in individual cylinders, poor seal of individual valves, leakage of intake manifold, premature or late ignition time, and improper idle speed adjustment. 2. If the idle speed of the engine is unstable, adjust the idle speed first, and check whether the idle metering hole and idle air hole are blocked. If the metering hole is blocked, clean it with gasoline or acetone and blow it with compressed air. Engine is a machine that can convert other forms of energy into mechanical energy, including internal combustion engine, external combustion engine, jet engine, motor and so on. The engine is suitable for both the power generation device and the whole machine including the power device.