What causes occasional jerking in BMW N52 engine?

[NathanRose]

BMW N52 engine occasional jerking may be caused by severe carbon deposits in the engine or aging engine components. Aging engine components: Car shaking is also related to worn engine mounts. Engine mounts are responsible for absorbing minor vibrations during engine operation. If the engine mounts fail, these vibrations will be transmitted to the steering wheel and cabin, causing shaking at idle. Severe engine carbon deposits: The most common cause of car shaking is excessive dirt on the throttle body or carbon buildup in the fuel injectors. When there is too much carbon deposit inside the engine, the gasoline sprayed by the cold-start injector will be largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts and making it difficult to start. In this situation, the engine will only start easily after the carbon deposits have absorbed enough gasoline. Once started, the gasoline adsorbed on the carbon deposits will be drawn into the cylinders by the engine's vacuum suction and burned, making the air-fuel mixture too rich. The engine's combustible mixture alternates between being too lean and too rich, causing jerking.