If you have air in your coolant system, gaps in the coolant if you will,
when that air flows through the IACV, it causes the idle to drop. When I
had my IACV not attached to anything when I had ITBs (Individual
Throttle Bodies) on the Civic, the idle was horrible. We made a plate
to bolt it to that sealed it off properly, and the idle returned to
normal.

When we reinstalled the normal manifold (ITBs aren't too good for daily
driver, I learned this the hard way.) and we had everything back to how
it should be, the idle was still sparatic. After about 10 seconds of
bleeding, the idle returned to normal idle.

Hope that answers your question.

-Wes


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