I believe your ar has an Idle Control Valve. On my 4 cyl it's located between 3 & 4 air runner wrapped in a rubber sleeve. They tend to get sticky from sucking up the blowby from the cylinder head.

To test, unplug, ground on one terminal, then tap the other terminal to + of the battery. You should hear a click when you do this. If you don't, switch the wires ( ground the other term and connect the other to + ). If you still don't hear the click you now have to check if the valve parts can rotate open and close. Shouldn't take much force to do this with a screw driver and take care not to gouge it.

If it's stuck blast it with carb cleaner, plug-side up, valve pointing down. Some guys soak the valve side overnight. Test and lightly lubricate before installing. If it still doesn't click...2 things: either the valve is busted or there's not power going into it (OVP I think).