Ole Long John says,

I'd try swapping out your Temp II sensor, or clean its connection.  What
your dealing with is cold start enrichment.  Sounds like the engine is a
tad rich until full operating tempature.

So, either your basic idle adjusment is off, a real possiblity or the
Temp II is ready to be replaced.  I personally get about a year before
mine goes, one lasted eight month.

The basic idle needs the signal from the throttle micro switch that the
engine is in idle.  You could've been a lubber, and sprayed it when you
swabbed ole Bill with that rum.  Use of VOM to verify the micro switch
is engaged.

Otherwise do a basic idle setup, look under my name in the archives, or
 under fuel injection setup.

Mark Keller
91 Vanagon.