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The MAF sensor is most likely the culprit. I just fixed my car last month, it had the same exact problem. It would surge/hesitate while I was cruising on the freeway for a couple seconds then stop. When I came to a stop, I had to keep my foot on the gas pedal to keep the car running. The IACV seemed like the problem but it wasn't.
The problem with the MAF sensor is that the signal voltage will increase or spike up for a few seconds that the PCM misinterprets it and sends out more fuel to injectors. when this happens on the freeway, the car would bog and loose power. And more than enough fuel at idle would make to car to stall and die. you can see this with a Voltmeter or a Scope.
Block EGR passage way might cause surging or bogging on the freeway but it wouldn't affect the car at idle.
Like someone has mentioned above. The IACV shouldn't cause the car to bog or loose power on the freeway.
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