HotZ - Good catch on the MAF. Those aren't cheap. The only potential problem is the screws sticking/seizing in the TB and breaking off. That can be repaired, but it's a PITA. Same with the IAC. Yes, I've broken off both of them in older cars. No fun. I just though he could "cheat" a little and try cleaning without removal first.
Cleaning the entire unit would be good. My thinking was that the bore/plate is so bad that just cleaning the plate would solve most of the symptoms and prove that he doesn't need to replace an entire array of sensors needlessly. I suspect the IAC is at least partially functional since there was no mention of wild startup idle issues.
Tech II is correct. Not only would a sticking plate make it really tough for the IAC to keep up with demand from rapid changes but it would make the presumed closed throttle position TPS voltage vary all over the map, creating mind-bending havoc for the PCM to try to guess at injector pulse width, timing, EGR function, and IAC position.