What is the engine jitter of Citroen c4l cold car?

The following are the main reasons for the start-up jitter of cold car: 1, and excessive carbon deposition in throttle, fuel injector and air intake may be one or all of them. 2. When there is too much carbon deposit in the engine, the gasoline sprayed by the fuel injection head will be absorbed by a large amount of carbon deposit during cold start, which will lead to too thin mixture during cold start and make the start shake. 3. Mechanical failures such as ignition coil, spark plug and nozzle lead to cylinder failure. 4. Low oil pressure or cylinder pressure leads to insufficient power. 5. The fuel quality is unqualified. 6. Idle speed control valve is damaged or too dirty. 7. Air leakage in the intake manifold. 8, engine arm or claw pad damage, etc. 9. The oxidation or low grade of engine oil is mainly due to poor fluidity at low temperature, and the cold start protection of engine is not in place.