What is the reason for the shaking and flameout of the 307 cold car?

The reason of carbon deposition is that the 307 cold car starts, shuts down or shakes. The relevant information is as follows: 1. Carbon deposition usually appears in the inner wall of throttle valve, intake valve head, intake port, piston top and combustion chamber. Excessive carbon deposition on the inner wall of solar terms will lead to insufficient air intake, difficult start-up or easy flameout at idle speed. After the water temperature reaches the normal working temperature of the engine, the computer repeatedly adjusts the position of the throttle valve plate, causing the idle speed to rise and fall. 2. The place most prone to carbon deposition is not only the throttle, but also the head of the intake valve (the end of the intake). Gasoline of indirect injection engine is injected into the intake space where the intake valve head is located, and gum, wax and unburned carbon compounds are deposited in this part. The surface of carbon deposit is loose and porous. 3, the amount of fuel entering the cylinder is insufficient, and the mixture is thin and difficult to ignite.