>>you never can be sure exactly what is causing the problem.
Well ain't that the truth! Not sure if you posted a pic like this (thanks stadsport) but it helps to show specifically which sub-components you're talking about, i.e. this has little to do with the IACV-Air Regulator... though it's tightly coupled with the AAC and FICD operation. Which do you believe caused the problem? AAC and FICD? Both are listed in the FSM as parts to look for seizing or sticking. 
Thank you for following up... especially with the graphs. They help give me confidence in your solution and provide me an invaluable reference. It's very surprising to see the ECU/AAC "hunting" up and down even at 1300 rpm. Jeesh! Do you mind sending me the data via e-mail? IMO, I think you should have posted to General as well. Great follow-up post. Glad I saw this.
OverZealous (CT) My General posts (click)
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