Good morning all,
I got help on this board some time back for the preliminary issues on this problem, but things just got more confusing. Any help is welcome. Brief history and summary:

1992, 960, ~130k miles. During warm months it was idling rough and hiccupping when crusing around 40MPH. Removed the TB and cleaned it up (per the FAQ on this site). New TB gasket, reassembled. Got rid of all my running hiccups and hesitations, but left me with a fast idle (~1000 when started cold, 1500-2000 when fully warmed).

Then followed advice here to check the TB gasket for leaks, check for vacuum leaks on the two lines near the TB (I think they go to the intake manifold if I'm remembering right?). Used a can of fuel injector cleaner to spray around the entire area (carefully avoiding the TB sensor switch, again per the FAQ). No noticeable increase in idle was seen, so the assumption was that everything was well sealed and there wasn't a vacuum leak and that the TB gasket was well sealed. Also went about adjust the throttle plate adjustment screws to make sure the plate was closing correctly. Still have a fast idle.

Then moved attention to the idle air control valve. Took it off, cleaned it out a bit to remove the tarnish, lacquer and gunk. Put on some fresh dielectric grease on the connections, reassembled. A little while later, not only did I still have a fast idle, but now I have codes 2-3-2 and 2-3-3, resulting in a check engine light. Reset the codes, it all comes back once the engine warms up. Checked, rechecked the connections. Nothing. So I replaced the IAC with a new one. That was last thursday.

With the new IAC I noticed that the engine seemed to be idling a bit smoother (could have been me just being hopeful). Ran about 15 minutes of local errands. Idle was still fast (1400 in drive), but I was figuring I might have to adjust the throttle plate again. I never got that far. The next day the check engine light came on again. Checked the codes, and there was 2-3-2 and 2-3-3 again.

Help? Any suggestions on what to check for now? Is it possible there's something up with the wiring leading to the IAC? Is it easy to check resistances in those to see?

And while we're at it, although this question is fundamental and might be silly... on the IAC there's an arrow which I assumed indicated air flow. Since I might have mixed things up, please confirm - air flow goes from the intake snorkle, thru the IAC, into the intake manifold, not the other way around, right?

Thanks!!!