Originally Posted by ps2cho

I was thinking ICV and midway through your post you mention it dies when unplugged. I think you found the culprit. It should not die on you.
Here's my theory -- Your ICV is getting jammed open and when you unplug the connector the car stalls because the system is way out of mixture spec.

Start by removing it completely (2 bolts as you have probably seen) and shoot it clean with carb cleaner. You'll be surprised how much dirt and crap comes out....
Try that first and see if it fixes the issue. I have a feeling its whats happening.

The rear temp sensor only affects the mixture during cold start up. Leave it overnight, unplug the connector then start the car. You should notice it takes more cranks than usual. After the car warms up it does very little for mixture adaptation. It is all EHA, O2 sensor and potentiometer from there on out.

Easiest way to center the plate is to use two pieces of newspaper. A little reading here for ya:
http://w124-zone.com/?p=253