Depending on the age of the Vanagon, it could need a new
throttle body.  I had similar problem a number of years ago
on my '64 1.8, and a new throttle body solved it
immediately.

John

On Sat, 2015-08-29 at 12:39 -0400, Larry Alofs wrote:
> I assume by MAF you mean the AFM, the air flow meter.  I
> wouldn't mess with
> that until thoroughly checking/testing/adjusting the
> switch on the throttle
> body.  Bentley 24.33-36
>
> Larry A.
>
>
> On Sat, Aug 29, 2015 at 10:20 AM, Spencer Allen <
> spencervw@aol.com> wrote:
>
> > Hi all. Need some help or suggestions to fix an idle
> > problem on my 85 1.9
> > auto trans westy. Engine idles ok at start-up idling
> > around 1100 rpm when
> > ambient temps are around 80+ and around 2000 when temps
> > are cooler 60s-70s.
> > The bouncing starts when after driving on highway and
> > engine is warmed up I
> > put car in park or neutral then it starts revving up and
> > down between 800
> > and 2000. It runs smooth at highway speeds and around
> > town with no surging
> > but at  stop lights or stop & go traffic and my foot on
> > brake I can feel a
> > slight pulsing. Within the past year I have installed
> > new O2 sensor, temp
> > II sensor, cleaned grounds and replaced some of the
> > small vacuum hoses and
> > plastic tubing. The plug for the idle adjustment has
> > never been removed
> > during the past 30 years so it hasn't been messed with.
> > Should I be looking
> > at the MAF next? Any help or suggestions would be
> > greatly appreciated.
> > Spencer
> > 85 westy auto
> >