What causes the Audi A6L to shake when starting?

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Audi A6L shaking when starting is caused by abnormalities in the intake system, engine carbon buildup, etc. The specific reasons and solutions are as follows: Abnormalities in the intake system: When the engine is running, the driver controls the throttle opening via the accelerator pedal to adjust the intake volume and regulate engine operation. Issues such as insufficient power and poor acceleration may result from damage to certain components of the intake system. The solution is to replace the relevant parts. Engine carbon buildup: Carbon deposits on the engine's valves and intake passages can absorb an appropriate amount of fuel, failing to achieve the required power performance, leading to shaking when the car starts. The solution is to perform a system cleaning.