Certainly, the harness may help if the problem is noise coming from the afm.

Many of us have resolved the actual AFM problem much more simply, and
inexpensively.

We basically cleaned the afm internals with an aerosol electronic spray
cleaner.

Carefully remove the siliconed-on AFM lid. You may have to cut the seal with
a utility knife. Remove all remaining traces of seal - so it will close
properly again without the old mucked-up seal getting in the way.

Spray said cleaner in the afm, moving wiper a couple of times. Let dry. LET
DRY . Keep fingers and dust etc from getting on the electrical points of
contact.

Replace lid and tape down.

Works really well, and will solve problems for many afms - my opinion is
that if it doesn't work - your afm is too far gone anyways, and the harness
fix wouldn't work for you.

Said cleaner is available at any flaps - just make sure is is electronic
spray cleaner - not electrical cleaner. You want a highly volatile cleaner
that evaporates really quickly.

Marshall Ruskin
84 Westy Buck-free since the spray fix (about a year)

>Danno, may have lead me down the right path for the problem source as
>being the poor signal at the AFM.
>
>My search found the following:
>
>Volkswagen technical bulletin group 24 # 92-02 April 30th 1992 explains
>of the bucking/surging fix is an updated box that has a diode or
>something to clean the signal.
>Part # 025 906 302A $150.00.
>Installation is as easy as removing the connector to the AFM and
>installing in between it and the connector.
>
>A clue I was looking for from my wife was any change in the tachometer
>when the bucking happened.
>She noticed no change in the tach, no flutter or drop during the surging
>
>I than ruled out ignition related problems like the hall sender and
>grounds related to ignition.
>It looks now to be as simple as a fuel filter (doubtful, just replaced
>before this trip) or the big $150.00 part.
>
>Thanks to all who responded.
>
>Unless I could of missed other options I have the part lined up in
>Indianapolis.
>
>Thanks again
>Rob
>