As you described, the vanagon gradually shutting
on/off
at freeway speeds, doesn't sound like intermittent
syndrome. Intermittent syndrome, the way I experienced
it, is more a abrupt loss of power.
In your case, I would first replace the fuel filter
and check fuel pressure.
It also could be an electrical problem, if it
coincides with incorrect readings on the gauges.
Check your battery contacts, grounds, ignition switch,
etc.
Harald
'90 westy

you wrote:
Van gradually shuts on/off at freeway speeds til it
barely runs.Could not
restart so was brought to shop. Charged $640 for
plugs, oil,cat conv.,oxy
sensor,3 hrs. labor,and adjustments.They told me at
first the ECM was dumping
fuel, (that's why they replaced my new oil &
plugs)then did the other
work.They said it ran fine but it did the same thing
after driving it for
about an hour on the freeway.I took it back to the
shop and they suggested
replacing the wiring harness for the air flow meter
($180 plus labor-$83/hr).
I said maybe later as my cash is low.Found solution of
soldering 22
microfarrad capacitor ($3) to terminals inside air
flow meter.(see
www.geocities.com/harald_nancy/intermitt._syndrome.htm).That
didn't fix
it.Friend suggested gas cap not venting fuel tank and
creating vacuum.Will
try that next.I also notice that when the problem
happens the engine temp is
at the cooler end of white area  and the fuel guage
shows empty instead of
half full.Any help appreciated.Thanx.

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