On the air box mounted to the throttle body their is a big hose running to the iac. If you pinch the hose the engine dies because it blocks iac air supply. The way you are talking about it you probably have a 2 wire. The iac also has 2 hoses going to it to keep it from freezing.
So look for and electrical plug and 2 cooling hoses.
So to carry on if it is a 2 way it is easier to stay 2 wire.
A 2 wire ecu will only run a 2 wire iac a 3 wire ecu will only run a 3 wire iac but the harness can be modified to run both. See what I am saying now.