OK, lets try this. The idle air control valve is used to control the idle speed. It does so by controlling some air around the throttle plate. On some earlier systems this was done by controlling the throttle plate, but those mechanism were awkward and inneffecient.
On your car, the air coming into the idle air control valve comes thru a large hose on the side of the idle air control. The throttle hang cure restricts the air that can enter the idle air control valve. A copper plug is used. A hole is drilled in the copper plug restrictor plate as a means of limiting how much air can enter during high demand but still provide enough for normal ilde speed control.
Did that help or did it just muddy the water?
