Could be the idle control valve..sounds like it.   Pricey but a simple fix.
I was just on Samba Classifieds and saw many for sale there, used (dunno
about a used ICV)...Also some have mentioned cleaning it with WD40 or carb
cleaner.  I tried that with no success so I got a replacment. Googled and
found one even less expensive than from "our" normal vendors.
Don Hanson

On Tue, May 26, 2009 at 9:50 PM, Bernie <berniej@gmail.com> wrote:

> Thanks to all who responded last week in regards to my vanagonproblems in
> Port Townsend.
> The ignition switch was the most pressing problem and the O2 sensor
> the secondary problem and both have been replaced.
> The list was dead on in nailing the problems for me.
> If you folks didn't exist I may have to sell my bus!
> I am left with only one problem and that is at a stop light vehicle's idle
> will move up from 900 to 1200. When I press on gas pedal it drops down
> to 900 again but not for long.
> I'm planning a trip soon and is this something that won't really be
> an issue or is it something that should be attended to before I go?
> Any thoughts appreciated.
> Thanks,
>
> Bernie
> Vancouver
>