What is the reason for engine shaking at idle but not when accelerating?

[MacRuth]

The reasons for engine shaking at idle but not when accelerating are: 1. Changes in fuel injection volume; 2. Malfunction in the fuel pump pressure regulator or sensors causing faulty fuel injection correction signals; 3. Cracked vacuum booster pipe; 4. Carbon buildup or dirt on the throttle body, or incorrect positioning of the throttle position sensor. The connection points between the engine and the frame are equipped with engine mounts, which absorb vibrations generated during engine operation. An engine is a machine that converts other forms of energy into mechanical energy, including internal combustion engines, external combustion engines, electric motors, etc. Idling results in low engine speed, which can propel the vehicle forward under light load conditions.