thanks Alex
>  What engine management do you have?

I'm absurdly ignorant, will go to learn how to find out whether it's
Digifant or whatever and report back.
I will check vacuum lines as both you and S DaRoota suggest

Alan

On Wed, Sep 23, 2020 at 1:54 PM <alex@mevay.org> wrote:

> Hi Alan,
>
> What engine management do you have?  Is it Digifant II?
>
> I've been trying to solve a similar or identical issue in my van
> (hesitation/misfire on abrupt throttle application).  Apparently
> vacuum lines or other unmetered air leaks are a common cause.  I've
> been through that, all the usual tuneup stuff, swapping AFM's,
> DigiFAST chip, all without much improvement.  My next idea is that
> maybe it's a fuel supply issue.  Clogged fuel filter, worn pump,
> sticking pressure regulator, etc. that allows the fuel pressure to
> drop too much or for too long on initial acceleration, leading to a
> lean misfire.  I'll post if I get to the bottom of it, but I'm also
> interested in other suggestions on this issue.
>
> Alex
>
>
>
>
>
> On Wed, Sep 23, 2020 at 4:17 PM al sinclair <alvanagon@gmail.com> wrote:
> >
> > Our '81 Vanagon (automatic transmission) tends to stall on accelerating
> > from idle, e.g moving off after sitting at a stop light. It's fine if I
> > keep the idle speed up a little with my foot on the accelerator. And
> while
> > moving there's a hesitation for well over a second when pressing the
> > accelerator after coasting before engine power kicks in - likely the same
> > issue.
> >
> > Is there another way to increase the idle speed besides turning the "idle
> > speed adjusting screw" (Bentley page 24.23)? turning that makes no
> > difference to the idle speed. I realize that's not addressing the actual
> > problem (of course it would be better to solve it) but increased idle
> speed
> > would avoid the stalls.
> >
> > Any clues to solving the underlying issue would be great too, but I need
> to
> > eliminate the stalls so my wife can drive the car.
> >
> > This is a different issue, because it's happened for years and the stall
> > issue is new, but noting it in case it's relevant: at speed if the
> > accelerator is pushed to the floor the engine hesitates, and only picks
> up
> > if I back off the throttle.
> >
> > thanks
> > Alan
>