Familia's idle speed is very unstable and the jitter is very severe. What should I do?

When the fuel passage represented by the fuel nozzle is blocked, it will cause insufficient fuel supply pressure, poor fuel atomization, unbalanced mixing ratio and incomplete combustion, which will lead to related failures. If the intake pipe leaks air, it will affect the real data reflected by the air flow meter, resulting in inaccurate control of intake air volume by ECU, unbalanced mixing ratio and unstable engine idle speed. Oil cleaning is also a maintenance project, which we call engine health care. There is something wrong with the oil circuit, and the emission exceeds the standard, so the car can't pass the annual inspection.