What Causes a Car to Shake When Accelerating but Not at Idle?

[StEmiliano]

The reasons why a car shakes when accelerating but not at idle are as follows: Excessive Carbon Buildup: When there is excessive carbon buildup in the throttle body, fuel injectors, or intake manifold, or when there is too much carbon inside the engine, it can cause the engine to shake. Solution: Clean the internal components of the engine. Low Cylinder Pressure: After prolonged use, the gaps between each cylinder liner and piston may become inconsistent, reducing power output and causing low oil pressure and cylinder pressure, leading to insufficient power and engine shaking. Solution: Reduce the gaps between the cylinder liners. Faulty Ignition Coil: If the ignition coil fails, it can result in insufficient or weak spark plug ignition, leading to engine misfires, difficulty starting, and shaking during acceleration. Solution: Replace the ignition coil.