What causes the shaking when accelerating in a Classic Focus?

[Pinto]

The reasons for shaking when accelerating in a Classic Focus are: 1. Damaged engine mount rubber. When the engine mount rubber is damaged, its noise and vibration reduction functions are insufficient, especially noticeable during acceleration and deceleration with significant shaking and noise; 2. Unbalanced wheels can also cause shaking during acceleration, with the steering wheel shaking more noticeably; 3. Excessive carbon buildup in the throttle body. Carbon deposits in the throttle body can lead to various minor issues, with acceleration shaking being one of them; 4. Problems inside the engine; 5. Faulty spark plugs. In the engine cylinders, the air-fuel mixture requires an electric spark to ignite. If the spark is weak or absent, it can lead to a misfire, disrupting the engine's balance and resulting in shaking and noise; 6. Clutch slippage. Both manual and dual-clutch transmissions transmit power by pressing the clutch plates. When the clutch slips, it can cause engine shaking similar to semi-engagement in mild cases, or jerking and even stalling in severe cases.