Jorn - you've likely seen this thread:
http://www.peachparts.com/shopforum/tech-help/369277-89-300e-w124-m103-high-idle-solved.html
There's a bit of sobering truth by Frank Reiner in post #7
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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"
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