The idle air control valve on the Honda CR-V is located on the intake manifold. It is computer-controlled, and adjusts the amount of air that enters the engine, which changes the rpm of the engine when a load is placed on it. If the vehicle has a lumpy idle, and it doesn't have a vacuum leak or any other reason for a bad idle, or if it stalls at an idle, but will start again and stay running with your foot on the gas, the idle air is suspect.
Remove the intake and strut tower bar, using the 12mm socket, so you can reach the idle air easier. Place rags under the idle air hoses. Loosen the clamps on the hoses, using the pliers. Pull the hoses off the idle air control motor. Unplug the wiring harness connector.
Remove the idle air control retaining bolts, using the 12mm socket. Clean the gasket-mounting surface on the intake, using the rags.
Install the new idle air control and tighten the bolts firmly, ensuring that the gasket is lined up properly. Plug in the wiring harness connector. Slide the hoses back onto the idle air control, using the pliers to hold the clamps open. Allow the clamps to close onto the hoses. Reattach the tower bar and tighten the bolts firmly.