Why does an automatic transmission car not move at idle and requires acceleration to move?

[DeMaddox]

If an automatic transmission car does not move at idle without pressing the accelerator, there could be two main reasons: first, the throttle body might be too dirty, so it needs to be checked and cleaned (the throttle signal is the main control signal for the transmission); second, check if the transmission is too dirty, causing increased transmission resistance. Here are the relevant details: 1. The car's throttle body plays a crucial role. If the throttle is clogged, the vehicle's power will be affected. It is the key point where air enters the engine, allowing gasoline and air to mix and combust efficiently. 2. The cleanliness of the throttle body directly determines the precision and smoothness of the engine's air intake. A dirty throttle body can cause the engine to idle roughly, stall, make the car jerk while driving, significantly increase fuel consumption, and most importantly, damage the engine or even cause it to stop working.