Katy,

A stuck throttle switch would probably not cause a high idle when the engine
is cold.  Normally it would either not idle when cold or idle too high and
run bad when hot.

The wiring for this comes from the bottom of the throttle housing to a
connector on top of one of the air intake runners on the right side.
Between the air cleaner and power steering pump.  You can check the switch
with an ohm meter by unplugging it at the connector and by using all three
hands hold your meter leads to the two pins in the connector and move the
throttle.  When completely closed and completely open you should have a
completed circuit.  At all positions between you should not have a completed
circuit.

The idle stabilizer control valve is on top of the engine, near the center
right behind the alternator.  It is a metal cylinder about an inch thick
with a electrical connector on the left and a visible hose that goes over to
the air intake area.  The valve is held to the engine by a rubber ring.

According to Bently this valve should vibrate and hum while the engine is
running.  Mine never has (I've had it for 5 years).

You can unplug the electrical connector and see if it effects the idle.

Or (with the engine off) you can pull off the hose that goes over to the air
box area and the carefully remove the valve rubber ring from the engine.
The valve is plugged into a rubber hose on the bottom that goes straight
down.  I cut a wine bottle cork in half to plug the two hoses.

There are other problems that can effect the idle on a vanagon, the temp II
sensor, the OX sensor, the connectors for them, or even a vacumn leak.

Randy Herd
86 GL Weekender
68 Kombi
98 Cherokee
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