You said that the miss seemed to jump between cylinders. How did you determine this? I had a slight intermittent miss with my old 400E and I could never figure out which cylinder it was to begin with, not to mention being able to tell that it jumped to another cylinder. I don't mean to be argumentative--I'm just curious.

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles