Alright, replaced the IAC, no change.

Yes, I can rev it up and save it.

Tried unplugging the MAF and starting it, no change. (No change at all, which is weird to me)

The exhaust leak is between the down pipe and the catback... The doughnut was rusted in place so we couldn't get to the bolts to tighten them down all the way. May have to take it to a shop to tighten them, unless someone has an ingenious idea.