What's wrong with the car idling?

1, the engine has serious carbon deposits, and the most common car with serious jitter is that the fuel injector throttle is too dirty or has too much carbon deposits;

2, ignition system problems, check the working conditions of spark plugs, high-voltage lines and ignition coils;

3. The oil pressure is unstable. If the supply pressure of the pump is abnormal or the intake pressure sensor is wrong or not working well, the body will shake;

4, engine parts aging; Excessive carbon deposition in engine exhaust will adsorb carbon in gasoline of cold-start injector, which will lead to too thin cold-start mixture and difficult starting.