I still don't think it's a problem.
I have a long, steep hill just about 2 miles from me that I will test this on, on Sunday (my first day off work). It's steep enough to get going with no throttle input. And I should be cruising pretty fast by the time I hit the bottom of it. I suspect the idle RPM will be higher.
Also, although I don't have access to any of the service manuals I did find this info regarding the IAC and PCM:
The idle air control (IAC) valve assembly controls engine idle speed and provides a dash pot function. The IAC valve assembly meters intake air around the throttle plate through a bypass within the IAC valve assembly and throttle body. The PCM determines the desired idle speed or bypass air and signals the IAC valve assembly through a specified duty cycle. The IAC valve responds by positioning the IAC valve to control the amount of bypassed air. The PCM monitors engine rpm and increases or decreases the IAC duty cycle in order to achieve the desired rpm.
The PCM uses the IAC valve assembly to control:
- No touch start
- Cold engine fast idle for rapid warm-up
- Idle (corrects for engine load)
- Stumble or stalling on deceleration (provides a dash pot function) <---that one I believe is where we get the increased idle RPM while rolling with the clutch pushed in.
- Over-temperature idle boost.
- Air Assist to Injectors.