>>>i have to disagree here ...

I disagree with your disagreement...

<<<the idle stabilization valve
<<<- is not a 'fan' ... it's a solenoid that pushes open/close a
<<<small valve.

Inside mine, it is a fan that spins, cleaned it off with carb cleaner and it
spun as I sprayed it...

I do not recall it there is a valve on the other side though, seems to
remember carb spray running out the other end.
Been told that it is adjustable in flow by a set screw.

It should vibrate or hum while running

<<<- the air permitted to pass through the valve is NOT metered.
look at the hose connection ... the hose from the valve connects
between the throttle body and the air flow meter:
downstream/after the metering of input air....>>>

The air going through the valve IS metered/measured by the AFM.  It is AFTER
the AFM and any change in volume is detected by the AFM
.
An increase/decrease in air flow by the valve is detected by the air flow
meter flap moving changing resistance and therefore changing amount of
DETECTED air flowing through the meter.

IF the valve inlet was BEFORE the AFM then it would not be measured.

Robert