Philip,
Since you mentioned the "fun" VW bulletin,
here it is for those who have not yet had
the pleasure of reading it.
(Actually this discussion started with the possiblity
of clogged fuel injectors causing similar symptoms as
the infamous afm-induced vanagon syndrome.
I still think my injectors are clogged.
Today I dropped the injectors off for ultrasound
cleaning, only $30 apiece, cheap insurance).
For those who suspect their afm has harmonic
vibrations, read on:
Technical Bulletin
Group:    24
Number:   92-01
Date:     February 29, 1992
Subject:  Vanagon Intermittent Misfire
Model(s): All Vanagon Digifant Fuel Injection Engines

CONDITION
After driving for 1/2 to 2 hours at a constant speed,
vehicle experiences lack of power, cuts-out or stalls,
often accompanied by bucking or jerking of the
vehicle.
In ALL cases, the vehicle will restart immediately.
This symptom may not re-occur for several
weeks/months.  Inspection by the dealer results
in nothing conclusive.
Some air-flow meters may experience a vibration
resonance of the metering potentiometer wiper during
extended constant driving.  This resonance causes the
air-flow meter to supply an intermittent signal
to the Digifant ECU.  The ECU will then default to a
"no-load" condition and reduce the injection time.

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