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The cold start valve only works at freezing or below, not likely this time of year in Austin. That may be an indication that things are working well as they should.
you mentioned idling at 1800 rpm, that could be the Aux Air Regulator allowing extra air for higher cold idle speeds. That should stop after a few min. They tend to stick, or leak air that causes high idle. I have mine blocked off because of that. you might pull off a hose and block it to see if it makes a difference in the idle speed while warm.
You could also pull the throttle body plug completely to see how it runs when not on the idle circuit, which is switched in by the throttle body when the throttle is closed. That is when the ECU "potentiometer" comes into play.
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