Posted this on the Samba, but not getting much action there.

Okay, get this:

87 2.1, all stock. Trying to diagnose some minor idle issues. Noticed my
idle control valve wasent vibrating with ignition on, instead it was making
a very faint whine (could really only hear it with my ear right next to
it). So, I put a known working idle control valve in, same thing. Then I
swapped in a known working idle control module (behind the right tail
light) and boom, the idle control valve starts vibrating.

However, it didn't really effect the idle of my van at all. If I had a bad
idle control module in there that was also causing the idle control valve
to malfunction, how could getting both working again possibly have little
to no effect on my idle?? just looking for an explanation. Repose off idle
does seem to have slightly improved however.

For those curious, my idle issues are: idles slightly high, at or just
above 1000. Also has a "pulsing" sound but rpms don't seem to pulse with
it. Can only hear it from the inside. Ive got a rebuilt throttle body with
a brand new TPS from Gowesty in the mail now, as I highly suspect I have a
slightly worn throttle body and I know my TPS isn't perfectly adjusted and
is incapable of being properly adjusted.

Anyways, Ill save those questions till after i get the new throttle body
and switch in, mostly curious about the module and valve effects on idle
(or lack there of??) Is it possible that my finicky throttle switch is
somehow not alowing the idle contol module to work as/when it should?