Friends,

    We have a 1998, Lumina, V6, 3.1 with 88, 500 miles.  A few months
ago it seemed to have an EGR problem.  Here is the link to the previous
thread:

http://groups.google.com/group/alt.autos.gm/browse_thread/thread/655e51321d56160
2/bff7ddeb660c43fc#bff7ddeb660c43fc

There was a lot of carbon buildup and the pintle seemed to be stuck
open.  I cleaned with carb cleaner and cleared the codes and it was
okay for a while.

    The 'Check Engine' light came on again and gave the code P0401
(EGR Insufficient Flow).  It ran okay except for a slightly rough idle.
I just took the EGR off.  The bottom of the valve, the metal flexible
tube that comes from the exhaust system, and the manifold going into
the engine is filled with (if you'll pardon the terminology) a greyish
or dull green snot like slime.  It's really the consistency of snot
with some black stuff in it that I assume is carbon.  Any ideas what is
causing this.  It's really gross.

Steve