My mind says Idle Stabilizer Control Unit.

Search the archives for ISCU... there is ample info on this rather complex
and pricey system.

The Idle Stabilizer Valve (ISV) is also involved, and often one of the parts
fails and kills the other.  Be careful if replacing, as you may find that
the new replacement gets a burnt out  transistor if the other part was bad.

good luck!

RSF

IMPORTANT!!! In order to reply to me, you must have the word "FISH"
somewhere in the subject line of the email.  Otherwise it goes directly in
the trash.

<�)))>{   <�)))>{   <�)))>{   <�)))>{   <�)))>{   <�)))>{

Robert S. Fish
Salzburg, Austria
1987 Wolfsburg Vanagon 2.1 GL Weekender
1987 Golf Cabriolet
1991 Golf

> J.
> The first thing that comes to mind is the TEMPII sensor.
>
> Ken Lewis

> ----- Original Message -----
> From: "J. Naser Motlagh" <JNMOTLAG@SPRINTPCS.COM>
> To: <vanagon@GERRY.VANAGON.COM>
> Sent: Friday, September 26, 2003 8:14 AM
> Subject: High idle after warm up
>
>
> > I have recently replaced my engine, and it runs great.  However, after
it
> > is warmed up my idle shoots up to 2000 rpms, then it cycles between 1900
> > and 2100 in about 3 second intervals.  Any quick thoughts?
> > --
> > J. Naser Motlagh, MBA, PMP
>