I did suspect the the new fan clutch. The tech changed it again but it didn't make any diference. It didn't feel like the clutch was ingaging, but than again may be its becouse the car wasn't hot.
Does MB has that vacuum advance ? I never hert of that one before.

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Dmitry
90' 300CE
17" Intra Signums
Brulen mufler
Euro Headlights/Clear Blinkers
White gouges (made my own)