How to stop Particles when player is idle

Another question I need to be answered is how do I stop my particles from playing if my car (player) is at a standstill? I tried to use the else if (!Input.anyKeyDown) trick but it stopped playing entirely. Could someone help me create a script to play particles when the player is moving (or key down) and stop particles when the player is not moving (when no key down)?

Help would be greatly appreciated once again. Have a good day/night, and peace!