Where is the IAC located on 1996 isuzu sidekick

First I haven't a clue about an "ISUZU Sidekick" and have never heard of one. I own many SUZUKI Sidekicks and suspect that is what you have.

There are two different engines in 1996 Sidekicks. If you have a 16L 16 valve motor, it will say "16 Valve" right on top the motor. On the Idle Air Control (IAC) is kind of under the upper side of the curve of the intake manifold. It has both coolant lines (2) and a hose for metered air coming from the cast aluminium tube just down stream of the maf sensor.

If you have Sidekick SPORT with a J18 (1.8L double cam motor) the IAC is pretty much on top the throttle body.

The IAC assembly, mounted on the right side of the throttle body, controls bypass air around the throttle plate. By extending or retracting a conical valve, a controlled amount of air can move around the throttle plate. If engine speed (rpm) is too low, more air is diverted around the throttle plate to increase engine speed.
During idle, the proper position of the IAC valve is calculated by the ECM based on battery voltage, coolant temperature, engine load and engine speed. If the engine speed drops below a specified rate with the throttle plate closed, the ECM will then calculate a new valve position.
On 1.6L engines, four different possible designs of the IAC conical valve may be used on these engines. The first design utilizes a single taper shape, while the second design uses a dual taper shape. The third design uses a blunt-tipped valve, whereas the fourth design uses a rotating shutter. Care should be taken to ensure use of the proper design when service replacement is necessary.,,,