Sounds similar symptoms to my son's Cabriolet - which turned out to be leaking
fuel injectors. Overnight the excess gas must evaporate, but after shorter
times the leaking gas collects in the intake manifold and causes very rich
running.

This should be easy to check: build up fuel pressure and pull the injectors.

Tom
Austin, TX

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From:   Vanagon mailing list on behalf of David Chasteen
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Does this make sense, or is my VW addled brain reaching for straws?  Any
input?
--
Chaz
"I'm growin' older, but not up"
'82 Westy "Peewee"
Brownfield, Texas