>
> From what I've read, the Auxilliary Air Regulator is a pain to reinstall,

I don't recall any particular difficulty, it's just bolted to the head
using the same holes used for engine grounds on the other head.

> so I'd like to get a better idea of how it could be causing the problem
> before I go further.   My understanding is that the AAR "fools" the air
> flow meter into thinking that the throttle is open further than it is by
> allowing more air flow to the meter. This increases the rpm for cold idle.

No fooling involved, the AFM  simply reports on whatever air passes through
it.  The Aux Air Regulator, as you suggest, allows extra metered air to
pass into the intake plenum without going through the throttle body.

when I pinch it off at startup the
> idle doesn't change. Thus the initial question as to what temperature it is
> open. It might open at freezing temperatures but is it open at 80 degrees?

It's open enough to make some difference on a cold start at any reasonable
ambient temp.

Yrs,
d