Weird idle problem involving Overvoltage Protection Relay

I really like this site and have found a lot of useful information here. Good job, guys.

I was wondering if you could help me with a problem. I see many posts about it, but have one additional point to ask about. I have a 1993 190E 2.3L. Briefly, my problem is:
I have an intermittent Idle Problem: When the engine is warm or hot, low idle (500 rpm) causes car to seem like it will stall in all gears, although the the car has not actually stalled. It runs fine if the engine is cold, or if I put light pressure on gas pedal to raise rpm to 1000 rpm. Acceleration and all other aspects of driving are great.

Removal of fuse on Over Voltage protection relay:
1. prevents a cold start (car left alone overnight). The engine turns over, catches, runs briefly (4-5 seconds), then stalls.
2. Will easily start a warm or hot engine
3. Will allow engine to run normally (idle at 800 – 1000 rpm) in all gears after removing fuse & starting engine
4. Removing then reinstalling fuse and starting engine after hot idle will allow 800 – 1000 rpm idle for a few minutes, but low hot idle will resume after those minutes.
5. ABS lights up on dash ir fuse is removed
6. Situation improves by briefly driving (10 blocks) without fuse for 10 minutes, but I dont want to do that since it likely will ruin the catalytic converter.

My question really is what else does the OVR power besides the things listed on your site? Are there any other suggestions that you can give me to troubleshoot? Thanks in advance for your help.