2002 Mitsubishi Montero Hesitation and lose of power at idl

Thank you blackop555 for your response. I greatly appreciate it. I'll will take this info to the dealership for their review. A 2003 vehicle with close to the same mileage was in their shop with it's owner complaining of the same problem. They could not find anything wrong with it or mine. Or, they could not mimic the problem for further investigation. I left it with the dealership from Fri to Tues. Since home, I haven't been able to get the problem to reoccur. The fuel filter, I'm told, is in the the fuel tank and never goes out on this model. The alternator and starter was checked as well as the fuel injectors. Nothing found. Point and plugs may need to be checked but I was advised that the hesitation and lose of power at idle is not a cause by the electrical system. What is an IAC module? The computer should pickup a failure like that I believe but I'll challenge the repair service at the dealership. But thanx again. Let me know what this IAC is and provide any info you have on this matter. Greatly appreciate your time.