Hello everyone,
I have with interest studied all these ASR threads. I live in Sweden and the symptoms are the same here...
I have a 1993 500SL on which I have had this problem the last year. Now when I see that there is hope i decided to do something.
My instrument says 87K miles, but it might has gone more...

It gets in Limp-Home (and ASR lights) almost everytime when I drive it out of the garage (cold). It occurs when shifting to drive (when I get low idle) or when hesitating with throttle. After some waiting and restarts it goes off, and when stopped at a redlight (low idle) it's back again. I think the problem is gone when the engine reaches temperature.

I blinked out the codes, and those who insisted to remain (at several readings and erasings) are:
ABS/ASR pin6: 30, Can data line to EA/CC/ISC module
EA/CC/ISC pin7: 3, EA/CC/ISC actuator
LH-SFI pin4: 13, which is a broken intake air temperature sensor. I noticed it when I did the readout, so I haven't changed it yet.
(The pins and codes have been translated as from Jim's S500 page. I suppose these are equal for S500 and 500SL).

Is it maybe even in my case the cable from the throttle actuator, or the pot inside the actuator?
Thank you for any help!
Best,
Rikard