Why does the car shake a little when starting?

[Shelby]

Car shaking after starting may be caused by the following reasons: 1. Unstable oil pressure: Abnormal fuel pump supply pressure or incorrect readings and poor performance of the intake pressure sensor can cause body shaking. 2. Aging engine components: Car shaking is also related to aging engine mounts, which transmit vibrations to the steering wheel and cabin, causing shaking at idle. 3. Severe engine carbon buildup: The most common cause of car shaking is a dirty throttle or excessive carbon deposits on the fuel injectors. When there is too much carbon buildup inside the engine, the gasoline sprayed by the cold start injector is largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts and making it difficult to start.