I spent days...sorry weeks trying to get my "new" 1991 300e Sedan to idle properly and start clean.
JohnM, your post really helped even though its 5 years old. Thanks to the other contributors, my car is running correctly again.

I did purchase the new 02 sensor as mine was old, replaced my plugs with Denso non resistor plugs and changed the seals around my injector nozzles. I replaced the ICV hoses, cleaned out my EGR tube (clogged) and changed the bearing on my smog pump. I changed the seal at the base of the fuel distributor, tested and cleaned the injector nozzles and ten connected a MM to 2 and 3 on X11 and got ~.5V (engine idling).
Nice start, smooth idle, no fuel smell in exhaust and I think I'm good to go for emissions.
Thanks again for the AWESOME post.
9/30/2015 - Update
Passed emissions. My HCs were very high though. Any thoughts?