Got an '87 Syncro that displays the following symptoms: Van starts fine
from cold (overnight, after work, etc...). I get to the stoplight at the
end of my development. I put in clutch (this is about 30 seconds after
start) and idle shoots up rather quickly to 3,000 rpm and stays right
there. Only after engine is fully warm does the idle back down to normal.

I think its the idle stabilizer valve, but don't want to dish out $200 to
find out its not.  Any suggestions on further troubleshooting or cheaper
alternatives?  If not, I guess I'll have to bite the bullet...

Thanks

Dan Cook
87 Syncro Westphalia - "the mule"
60 Porsche 356 coupe