C Holmes,
Maybe the timing is off..techs out there, does this happen when the timing chain "strethes" a bit, what are the other causes? maybe the distrubuter is offset

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1996 E320
2000 C230 Kompressor
1988 190e 2.3 - 225K miles, owned for 7 years. I cannot say enough good things about this car. Very well built, even at 225 it ran like new.