Why does the car shake after starting?

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The reasons for car shaking after starting: 1. Low ignition energy: As the vehicle's usage time extends, the spark plug's ignition gap tends to increase, resulting in reduced ignition energy, causing the car to shake; 2. Carbon deposits on valves and intake passages: Carbon deposits absorb some fuel, leading to ECU judgment errors, insufficient fuel entering the cylinders, resulting in insufficient power output and shaking; 3. Incorrect mixture ratio: Normally, the oxygen sensor operates at around 370 degrees Celsius, but a newly started car cannot reach the required temperature for the oxygen sensor to function, causing it to be inactive. This leads to errors in controlling the air-fuel mixture and ignition timing, resulting in a completely chaotic mixture ratio and vehicle shaking; 4. Varying cylinder conditions: After prolonged use of the engine, the ignition gaps and timing control of the spark plugs in each cylinder can vary, causing reduced power output and shaking.