Rather than clutter this thread, I've started a new thread, "Intermittant 500E ASR problem" here:
http://www.peachparts.com/shopforum/showthread.php?threadid=39898

I'm giving notice here for better visibility.
In short, I only get it during startup (sometimes), and so far only during a cold start or when the car has been sitting for at least 4-hours. Yes it goes into Limp Mode. Disappears after a restart.

Please respond to the new thread:
http://www.peachparts.com/shopforum/showthread.php?threadid=39898

Thanks,
:-) neil
1988 360TE AMG
1993 500E