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do not screw with the IAC
the VSS is a load signal
the ECM sees it and has been programmed to do certain things when the car is moving faster or slower or stopped
if you tamper with the IAC the ECM will see that
and it will respond as it has been programmed
the ECM can control idle speed with ignition timing AND your faster idle while rolling may be a result of that as opposed to change in IAC command
you may want to connect a scan tool
a real scan tool not a wheel chock code reader or
scangauge
and drive around watching IAC command and IGN timing command
with VSS
with TPS or closed throttle switch
just to learn more about your system , before you start
fixing that which is not broken .
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