Sounds to me like it might be another manifestation of the infamous and
dreaded "intermittent power loss" syndrome rearing it's ugly head, again.
Sorry to have to admit, but, been there, done that and am currently working
on the sequel.   I am not sure which archival message you are referring to,
but, I recently sprung for the price of a "wiring harness upgrade, genuine
VW" from the Bus Depot.  But w/ a price of $119.95 I do not believe that I
would recommend it to you.  It's basically nothing more than a very
expensive 6" extension cord.  Despite it's claim to the contrary, I do not
see how this item can be of much real use expect maybe having to do with a
very specific problem of a lack of length on your original  wiring harness
branch to the air flow meter.  And if that were your problem, a hank of
wire, few crimp fittings and a pair of crimp pliers would fix you right up
for alot less bucks.  My researches suggests to me that the ECU brains in
the Vanagons are fairly rugged units and not easily damaged.  Should only be
suspected only after a careful examination and elimination of all other
possible causes.  One of the first things you might check-out is replacing
the fuel filter and making sure your fuel pump is doing it's thing like it's
suppose to.  If you know you are getting fuel to the engine then that's at
least half the equation penciled in for you.  The most simple fix can
sometimes be the most obvious.  You wouldn't be the first one to get a load
of crappy gas.  If it gets more complicated than that let us know.  Be happy
to share more of the details of our own similar type problem and help walk
you through a few minor testing procedures, if you like, to the extent that
we are able to.  Keep us posted.

David Gunning & Sammy da Dog
Lovell, ME 04051