Why is the new car idling unstable and shaking?

[StBradley]

The reasons for unstable idling and shaking in a new car are as follows: 1. Engine carbon deposits: When there is excessive carbon buildup inside the engine, it can cause idling shake after a cold start. This happens because too much carbon absorbs a large amount of the injected fuel, resulting in an overly lean air-fuel mixture and making it difficult to start. 2. Ignition system issues: Check the working condition of the spark plugs, high-voltage wires, and ignition coils. Poor performance of the ignition system or weak spark plug firing can also lead to such faults. 3. Unstable oil pressure: If you have already cleaned the engine carbon deposits, cleaned the throttle body, replaced the oil seals and spark plugs, but still experience body shake during idling, it is recommended to visit a 4S shop to check whether the fuel supply pressure and the intake pressure sensor are functioning normally.