I had this problem for a while.  I came across a parts van and tried
swapping the idle stabilizer valve, and the cold idling problem went away.
Now the idle speed just bobs up and down just slightly, but it always
idles when cold.

By the way, in my limited experience, even the part that you think is good
can sometimes be the source of the problem.  At least a couple of good
mechanics told me that the problem as described was not caused by the idle
stabilizer valve.

HOpe this help,
David
2 '87s, and still trying to figure out which one to sell after a year

On Wed, 1 Dec 1999, instructor wrote:

> Hi All,
>
> Recently I have been having problems with my 90 vanagon idling when cold.  I must apply gas to get it started but it will immediately die without me intervening with the gas pedal.
>
> I am told that the throttle valve switch can cause a similar problem.  I checked and adjusted the switch per the Bentley but the problem still persist.  I "jumped" the connector to simulate a closed switch and it still died.
>
> The Idle Stablizer Valve seems to be fine since it "hums and vibrates" like it should.
>
> The wisdom of the List is my last resort before it makes it's idleless trip to the VW dealer.
>
> Thanks,
> Williie
>