Excuse me, is it normal for the double-ring SCEO engine to shake seriously when starting a cold car?

First, there are several main reasons for the start-up jitter of the cold car: carbon deposition, weak ignition, low cylinder pressure, unqualified fuel and so on. The more detailed reasons are as follows: 1: There are too many carbon deposits in the throttle, injector and air intake, which may be one or all of them. 2. When the engine has too much carbon deposit, the gasoline sprayed by the fuel injection head will be absorbed by the carbon deposit during cold start, leading to cold start.