Thanks Gilly.
We drove the car a bit after cleaning up the plugs.
I will try to get the non resister plugs this week.
At first it ran really nice, then when the temp gauge got to 85/90, it started to misfire agin.
I felt that changing to 20/50 might help it run better, but it seem as bad as before.
I saw in my MB CD, that the usa/cal cars should have the Duty cycle set to 35% to 45%. I knew that last time I set it to 45/50, and when I checked it today, thats what it was. I tweeked it down to about 40% and its close to that at 2500rpm too.

Do you think the misfire we have is just the bad oil seals, and have you seen this before or am I just thinking wishfully that the seals will cure it.

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2009 Mercedes ML320 Bluetec