What should I do if the new Emgrand 1.3t cold car starts to shake?

It should be caused by carbon deposition in throttle and air intake. When the car is cold, it will absorb some gasoline, which will lead to the mixture being too thin when the engine is idling, which will lead to the unstable idling of the car. So you should check whether there is too much carbon in the throttle and air intake. If there is too much carbon deposit, the cross-sectional area of the air passage will change, which will make the control unit unable to accurately control the idle intake, resulting in too lean mixture, abnormal combustion and unstable engine idle speed.