My first suspicion would be a collapsed but more likely leaking vacuum
line.

I found the hose from the Crankcase vent on top of the engine over to
the AFM was rotten underneath. There was a hole underneath, not visible
with a casual look.

Regards,

John Rodgers
88 GL Driver

Matthew Turner wrote:

>Hi, this is my first post to the list...
>
>I have an 87 Vanagon Wolfsburg named "Vera" with 4-sp manual that is
>doing something strange. Well it does a lot of strange things, but
>we'll talk about those later.
>
>Zeitgeist's post about the throttle hesitation made me think of this.
>
>When I slow the van down, and come to a stop at an intersection, the
>engine revs up to about 2000 rpm and sits there. I've not been able to
>find any rhyme or reason to it so far. It will do this if it's in gear
>and the clutch depressed, or if it's just sitting there in neutral.
>The second that the clutch is let out the rpms drop back to idle and
>the van starts moving.
>
>If I'm going to be sitting at a light for any length of time, I'll
>bring the rpm back down by doing one of two things. One, is to quickly
>stomp on the gas pedal and immediately release it. The engine revs up
>to 3k and then returns to a normal idle speed (1k or so). This trick
>works 60 percent of the time. The other way I slow the rpm back to
>idle speed is to get into first gear and ease the clutch out a bit
>with a firm foot on the brake. This is very effective, but I'm sure
>it's destroying my clutch.
>
>Thanks for any help y'all can offer.
>
>Matt Turner
>Bay City, Michigan
>1987 Vanagon Wolfsburg "Vera"
>
>
>
>