okay, I got at the ICV and cleaned it out. The car no longer dies at all, and the rough idle is no longer constant. It's back to more of a hicup that comes about ever 2 seconds. The hesitation is much better, but still exists.

The ICV didn't look too messy, although once I cleaned it I noticed that the valve opened and closed much more easily. Could there be something else about the ICV that could be causing my problem, or should I move on to something else?

The vacuum hoses leading in and out of it seemed pretty new- they were very flexible. However, they weren't attached to the ICV with any kind of clamps, and I found it pretty easy to pull them off and put them on. Could this be a potential issue?

Would it be a good idea to test the voltage of the ICV somehow? If so, is it a bad idea to do it with the air filter assembly removed? And what voltage would be considered reasonable?

Thanks!