What are the reasons for car shaking after starting?

[MacJude]

Car shaking after starting can be caused by: 1. Low ignition energy; 2. Poor fuel atomization at low temperatures; 3. Fuel requiring higher ignition energy; 4. Increased spark plug gap due to prolonged vehicle use; 5. Severe engine carbon buildup; 6. Poor ignition system performance, resulting in inadequate spark plug firing; 7. Unstable oil pressure. Solutions include: 1. If dismantling the intake tract for cleaning is not feasible, use a non-dismantling fuel system cleaning device, though the effect may not be as ideal as dismantling; 2. Consider replacing spark plugs—clean or adjust the gap if possible, but replace if they are in poor condition.