I'm waiting for all the responses to come flooding in. Don't see any yet.

temp sensor for the ECU comes to mind.
I wonder if disconnecting the 02 sensor might help it , or reveal something.

if it clearly seems to be missing on a cylinder or two at idle.......you
could do the ole pull on plug wire at a time, trying to find weak or dead
cylinders.........to at least point you in a direction to work on.
And I would always say 'check the basics' first.
Including a nice careful visual inspection - like say, the vacuum line to
the fuel pressure regulator could be off or broken.

also.........here's one I find regularly  - the throttle switch at idle.
Check that adjustment.  I find lots of those not working right.
Air and fuel filters are basically OK ?
Scott
www.turbovans.com

----- Original Message -----
From: "Finn Runyon" <finn.runyon@VERIZON.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Monday, August 24, 2009 5:42 PM
Subject: Warm engine missing 87 Westy GL

> Hey Everyone,
>
> I have been off the list for a while as my 87 has been moth balled since
> last simmer, thank you in advance!  I have had much assistance over the
> years!  At the end of the summer last year after a 1200 mile trip my
> engine
> started acting up.  It starts well and warms up smoothly.  As soon as it
> gets warm, simply at idle it starts running really rough as if it is
> running
> on only 2 or 3 cylinders.  Also black smoke from the exhaust.  It I try to
> drive, or rev the engine, it will accelerate very poorly, missing
> terribly.
> I have been searching the archives to no avail.  Can anyone offer an idea
> at
> to what is going on?
>
> Thanks,  Finn Runyon