Sure sounds like it, getting misfires? Have you had it over heat? I thought MB had gotten that figured out around 92-93, maybe not.

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1981 300TD
2005 C55
2004 E500
1999 ML430
1992 400E
1998 C43
2001 SL500
1988 300SEL
1986 190E 16V
1991 190E 2.6