Yes, I did replace the center coil wire, it was brand new along with the rest of the set. I am thinking of starting with the least expensive route and getting the correct Bosch H9DC0 spark plugs and setting the correct gap of .032. If the problem persists, I will order a new coil from FastLane.

Any other ideas?

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280