It's cold. After the vehicle starts, it shakes badly when you step on the brakes.

As long as the water temperature is normal, it will be fine. No problem. It's cold in the morning or after parking for a long time, and the engine water temperature can't reach the normal temperature. The engine computer regulates the supply of rich mixture, and the oil supply is too small to meet the lubrication requirements, so the speed is high, the noise is loud or the work is unstable, and the waste smell is strong. As the engine warms up, it will slowly return to normal idle speed.