Hey guys;

My '85 Westy (1.9L/automatic) is acting a little strange lately.  First thing
in the morning it starts right up and idles smoothly (well a little rumble).
After a couple minutes of idling the idle speed starts to drop and becomes
rougher until it dies.  On restart it needs some coaxing to keep running.  It
scoots pretty good on the road but has a crappy idle when sitting in traffic
for about three miles then everything is beautiful once again.  In the
afternoon on cooler days (40's F) it does pretty much the same thing.  I
replaced the ISS three weeks ago (cured the Harley-esque idle I bought it
with), roter and cap are pretty new, and I'm running Platinium +4's and a K&N
air filter.

Any hints?

Thanks
Chuck