Yes, replace your idle stabilizer control module. Same thing happened to me: http://www.van-cafe.com/home/van/smartlist_755/smartlist_755/idle-stabilizer-control-unit-c755  

You can find used ones on The Samba for $75-$100, but they will all fail sooner or later. These are often left off their wall brackets (or mounted upside down) in the right rear corner behind the right taillight and the air filter intake where they get wet. Also, old electrolytic capacitors in these fail after 30 years.  Rebuilt units have replaced these capacitors with modern types and are sealed.

Stuart

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Dennis Haynes
Sent: Saturday, April 23, 2016 6:39 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: High idle

You most likely have a bad controller.

Dennis
 

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Grant Johnson
Sent: Wednesday, April 20, 2016 10:42 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: High idle

Well I unplugged the Idle control valve and my rpms dropped to about 900, and I've been able to drive without incident. Clamping the S house didn't have any effect though, I thought that it should have helped if the ICV was the culprit?

On Wednesday, April 20, 2016, Jon VonOhlsen <jondvo@gmail.com> wrote:

> Check throttle position, sounds like it may be stuck.
>
> On 4/19/2016 5:18 PM, Grant Johnson wrote:
>
>> Just wanting to pick some brains. My vans idle is stuck past 4000. I 
>> unplugged the ICV with no effect, and clamped the S  hose with no effect.
>> I'm a ferry ride and 40 minute drive from home, not really relishing 
>> driving her home like this. Any suggestions would be great!
>>
>
>