Which plugs did you use? I don't suspect a coil since it powers 2 cylinders which would likely generate a second misfire code. I would very carefully re-check the plug and the connector or wire on the misfiring cylinder.

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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