The idling jitter of 3.0T A7 is obvious, especially on the front legs. Is it normal?

The idling jitter of 3.0T A7 is obvious, especially on the front legs. There are several situations of engine jitter, such as gear start jitter, cold start, insufficient three-way catalytic temperature, and serious carbon deposition in the engine. 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.