What caused the burst of c50 throttle pipe in Great Wall?

The reason why the idle speed is a little shaky after cleaning the throttle valve of Great Wall c50, and the throttle valve fails; The spark plug and throttle are too dirty or the fuel injector has too much carbon deposit, so the gears start to shake, the three-way catalytic temperature is not enough, and the engine has serious carbon deposit. This is the most common reason for the car's shaking, because the gasoline adsorbed on the carbon deposit after landing is sucked into the cylinder by the engine for combustion. ...