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