Gary, I would suspect either the idle stabilizer relay (located behind the
right rear tail light in your '87 Wolfy) or the stabilizer valve itself. The
valve can be cleaned (see Joel Walker's description in the archives) and if
necessary can be adjusted (secret hiding place behind screw inside electrical
connector). I have been told that an air leak can also cause a surging idle
but I haven't figured that one out yet. Perhaps another List member can shed
some light.
-Larry
'86 Syncro Westfalia

Gary McEachern wrote:

> Hello folks
> The idle on my new '87 Wolfy (almost) continually surges between 1000-1200
> RPM. The surging occurs about once every second or two. Sometimes it stops
> after it has been running for some time.
>
> I know this problem can be caused on the 83-84 model years by a bad or
> misadjusted idle switch or a bad idle stabilizer but neither of these are
> used on the 87 model.
>
> Any suggestions?
>
> Gary