My first thought when I read your problem was IAC. I had Idle Air Control problems on my car when I got it, albeit was extremely high idle under all circumstances. While we're thinking about startup idle problems, I have a hot startup stumble. When I depress the clutch on hot startup, the idle drops to 4/500 RPM for seconds before it recovers to 8/900 RPM. Cold idle is fine now. Sorry, don't mean to high jack your thread.
Jack