Why does the car shake like it's convulsing?

[PrestonAnn]

The reasons why a car shakes like it's convulsing are as follows: 1. Severe carbon buildup in the engine, causing uneven fuel-air mixture and resulting in shaking. 2. Unstable fuel supply pressure leading to shaking. 3. Malfunction in the ignition system. 4. Damaged engine mounts. Engine mounts are responsible for absorbing minor vibrations during operation; if they fail, severe shaking occurs. Solutions are as follows: 1. Check the engine mounts for aging or cracking issues. If found, replacing them can resolve the problem. 2. If the steering wheel shakes during highway driving, it may be due to poor tire balance. In this case, perform dynamic balancing on the two front wheels. 3. If the steering wheel shakes when braking at high speeds, replace the front brake pads or discs. 4. If the car body shakes during acceleration, inspect the driveshaft for issues or check the fuel filter and spark plugs. Replace them if necessary.