I had a similar set of symptoms (hunting idle, etc.) on a '91 Jetta,
probably the same motor, it was the idle stabilizer, aka idle control
valve.  Replaced it (not cheap, $200 or maybe a little more) and
everything worked as before.

I like that 1.8l 8V, it's non-interference and was very reliable for me.

Allan
--
1991 Vanagon GL

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