Why does the car idle with a slight shake when cold?

[DelTyler]

The reasons for slight shaking during cold idle: 1. The car's engine oil, transmission fluid, brake fluid and other various fluids are not warmed up, and the water temperature hasn't risen yet - the entire vehicle is cold; 2. Poor combustion in the cylinders, which leads to insufficient power output from the engine, causing the car to shake. Idling is an operating condition of a car where the engine runs in neutral gear. The engine speed during idling is called idle speed. When adjusting idle speed, the RPM shouldn't suddenly increase or decrease, otherwise it may cause premature wear to the engine. Idle speed can be adjusted by modifying the throttle opening size. Idling essentially means the engine is running but not doing any work.