[Beav]

No, the IAC won't cause a misfire. It only adjusts the idle speed, nothing more.

Sounds as though you may have an injector that is leaking down a bit overnight. When first started the excess fuel in one cylinder will cause a miss until it clears out. Normally it should only take a few seconds to clear out, any more than that and you probably have a different problem. You might try some Techron, but don't go crazy with it. If the first dose doesn't do the trick adding more probably won't either. Remember Moore's Law.

There is no way to observe the IAC in action. It only moves when directed by the ECU. It is in a constant state of motion during operation, it doesn't just sit in one spot. It does move such a small amount, and very quickly at that, that even if you were able to observe it you may not even see it moving.

If the problem takes longer than a few seconds I'd be taking a close look at the coils and their boots. A little condensation when cold on the plug, boot or coil tower could cause a misfire until warm enough to evaporate the moisture.