It may well be your ICU. They get Cold Solder Joints. I futzed with a bad/no idle and stalls. Cleaned the ICV twice with no results, replaced the OVP with no results, then bought a used ICU and VOILA! It fixed it and it has idled and not stalled for almost 2,000 miles.
I just happened to noticed that when my car did idle it was high, then would cut out or drop too low. I rapped on the ICU and it died. Thinking it may be a coincidence, I started up , it idled high, I rapped on the ICU and it cut out again. Did it two more times with the same result. Got a used ICU off Ebay and it purred. Have not resoldered the original ICU yet, but it is on the list.

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1986 Euro 500SEC "RUF" 9:1CR, "Rose"
1985 Euro 500SEC Cabriolet AMG Widebody
1982 Euro 500SEL "Blue"
2001 Texas Heeler (Aussie/Queensland X) "Sulphie",
2012 Queensland Red Heeler "Squeak"
Best dogs I've ever had.

Did you ever determine what was the problem....positively?
I have the sane stalling while going around corners problem on an 86 420 with 165K.
Thanks,
Dave
(AMCO)

has the cranshaft pickup sensor been replaced on your car? the original ones had a green outer colour and the replacements are black.

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David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
http://www.w108.org/gallery/albums/A...1159.thumb.jpg

I'll bet that now the fuel pump relay is changed he won't be having any more problems.

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1985 500SL Euro w/ AMG bits 130k
1984 300SD Turbodiesel 192k
1980 240D Stick China 188k
2001 CLK55 AMG 101k
2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!!