The starting engine of Toyota Fangrong shook badly and made a lot of noise. What should I do?

When Toyota Fangrong started the engine, the vibration was serious and the noise was very loud. Generally, there are several conditions of engine jitter, such as starting jitter, cold start, insufficient three-way catalytic temperature, and serious engine carbon deposition. The most common reason for vehicle jitter is that the throttle valve is too dirty or the nozzle has too much carbon deposit, because the gasoline adsorbed on the carbon deposit after landing is sucked into the cylinder by the engine for combustion, and the combustible mixture of the engine is sometimes rare and thick, which leads to idling jitter after cold start. Solution: The company cleans the oil circuit, and checks whether the idle motor has carbon deposit, so it should be cleaned.