Intermittent rough idle

2002 caravan, intermittent rough idle. Unable to replicate or diagnose at the dealer. Seems to accelerate a little rough at this time. It is a higher milage veh. approx 160k. If this is iac, where is it located?
Thanks Steve

Follow the gas pedal cable to where it mounts on the throttle body. Two sensors are here. The TPS sensor (throttle) is at the pivot end of the butterfly valve for acceleration. The IAC sensor is the other sensor.