I found this article most helpful in regard to idle issues:

https://vancafe.com/blog/vanagon-running-problems?_kx=xZFBR9Rx-PFE9S-tejGxP93Mru0yzla_qTnb_eHHlhA%3D.Sy4yet

On Tue, Apr 26, 2022 at 8:01 PM Dan N <dn92610@gmail.com> wrote:
>
> 1st guess... vacuum issue...
>
> 2nd guess... throttle body switch
>
> On Tue, Apr 26, 2022 at 8:37 PM Eric Caron <ericcaron96@comcast.net> wrote:
>
> > Hi folks,
> >
> >         So Tom Bues and I are home after flying to Florida and picking up
> > a well loved and well traveled 84 Westfalia.
> >
> > We were picked up at the airport by the previous owners and driven a hour
> > to the van.
> >
> > We had a little time to talk and pack up the van then off we went.
> >
> > First night, camp out in the Super Walmart to sleep but also to get all
> > needed for travel and camping.
> >
> > We checked the van and the oil seemed ok and the coolant down a bit.
> > Filled coolant and started a 375 mile drive for our first stop at a KOA in
> > SC.
> >
> > We were warned that there was a idle issue.  And, there was.
> >
> > Tom has the same van and experience of decades driving it.  He managed to
> > deal with the van wanting to stall at every stop and kept us moving.
> >
> > So, later we did find a way to stop the van from stalling and diagnose
> > that issue.
> >
> > So, list , any ideas of what to check for a van stalling at stops and
> > otherwise seeming to run well?
> >
> > Problem solution was mentioned by my friend art over the phone, Tom, and
> > camp ground folks at a vW event.
> >
> > What is your guess?
> >
> > Eric Caron
> > 84 Westfalia
> >