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Amp draw as recommended by P.E.Haiges is the MB method for debugging the plugs. I ran into this similar problem over the winter where one of my plugs did not show fault by the resistance method.
Rather than changing all the plugs, and not willing to spend $200 at the time for the correct ammeter, I removed each plug, one at a time and tested them by hooking them to a battery (used jumpercables for this). Turned out to be #3 plug. All well now.
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https://goo.gl/photos/J8ZUVvAYiYqLxbD18
1989 560SL 111Kmi
2007 E550 4Matic 157 Kmi
2000 F250SD 7.3l, 1996 Explorer Ltd 5.0l
1965 VW Beetle Deluxe 115 Kmi
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Previous MB:
1983 240D Euro Manual 144 Kmi
1983 300SD 495 Kmi
1986 190D 2.5 100 Kmi
1986 300SDL 202 Kmi
1991 300D 2.5 Turbo 91 Kmi
1998 E320S4 (4-matic wagon) 140 Kmi
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