Thanks to all who contribute to this list -- good reading.

My current vanagon issue (besides the head gasket thing :( ) is that the
engine will not idle when it's cold AND wet.  We get a lot of wet days here
in Portland, OR.  Last week, we had dry days/nights --> no problems with
idle after a cold start.  First day of rain --> engine would not idle after
cold start.  Engine dies within seconds of removing foot from gas pedal --
not fun in city stop-n-go traffic.  After around five minutes of warm-up,
the van idles just fine.

This issue started last about 6 weeks ago after returning from a day of
snowboarding on Mt. Hood.

I've searched the archives -- plenty of info on cold idle fixes but nothing
on cold AND wet idle issues.  I will look into the temp sensor, O2 sensor,
idle stabilizer valve, etc.

Any other bright ideas or components to focus on?

Thanks,

Dave