It won't cause damage but the engine will never get to a high enough operating temperature which won't be good for fuel econommy and may throw up a few codes ie o2 sensors not hot enough , i would'nt leave it out , why do you want to ?
SOURCE: IAC Valve Location - 1996 Jeep Grand Cherokee
The idle air control valve is located on the back of the throttle body. It has an oval electrical connector and two torx screws holding it in. Unplug the connector, remove the two screws then lightly tap the body with a soft faced mallet to loosen it from the body.
Once you have it out and prior to installing a new valve clean the seat inside the throttle body where the idle control fits. This must be very clean! Installation is in the reverse order.
To save some cash, pull the valve out and clean it with throttle body cleaner, this usually fixes the problem for quite a while.
Good luck and hope this helps.
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