Do automatic transmission cars have idle speed?

[MacMarcus]

Automatic transmission cars do have idle speed, which is one of the five basic operating conditions of an engine, representing a working state when the car engine is running without load. Idle speed refers to the engine running without any load, only overcoming the internal friction resistance of its components without delivering power output. In other words, when the engine is running and the accelerator pedal is released, it enters idle speed state. The idle speed can be adjusted by modifying the throttle opening size and idle fuel supply quantity. As long as the engine doesn't vibrate within the idle speed range and maintains good acceleration performance, the setting is appropriate. It's important to note that when adjusting idle speed, the RPM should not fluctuate excessively, as this could cause wear to the engine.