I went through a whole bunch of stuff to try to eliminate a similar problem
with my '85.  Start with the cheap stuff first.

Make sure the intake boot is well attached and in good condition.  (This was
actually my final solution after all the other stuff.)
Check the carbon track in the AFM -- mine had a bad spot just above the
normal idle position.  I enlarged the screw holes in the board and shifted it
so that the arm ran on a fresh track. (This was my next to the last step and
solved most of the problem.)
Check on the condition of all the vacuum lines -- especially those small ones
attached to the fuel pressure regulator.
Check the fuel pressure and function of the fuel pressure regulator.
Try tightening the AFM spring some.  Be sure to keep track of the number of
notches you move the wheel -- you may want to put it back at some point.

Chuck
'85 Wolfsburg Westy - 'Roland the Road Buffalo'

In a message dated 4/2/2002 10:25:22 AM Central Standard Time,
LISTSERV@GERRY.VANAGON.COM writes:

> Date:    Tue, 2 Apr 2002 10:54:21 EST
> From:    JordanVw@AOL.COM
> Subject: 1.9L bogging down on acceleration when hot..anyone ideas???
>
> when i drive my '84 1.9L wbx for a while, then stop at a light and idle for
> a
> few mins, then pull out again, there is no response at first when i step on
> the gas, it bogs down and then finally starts moving when the guy behind me
> is almost up in my rear bumper..  any ideas?  i've been adjusting the idle
> speed screw, it doesnt help.
>
> Thanks in advance-
>