I threw a bottle of FI cleaner into the gas tank, full bottle to half a tank (directions say full tank, so kind of a stronger dose). I thought I noticed immediate improvement but it wasn't so, the stutter remained.

Last night I replaced my plug wires (bosch, installed a year to a year and a half ago) with the old Bremi wires that were on the car when I got them. I tested the resistance across all of the wires, the Bosch wires were roughly all about 1.3k and the Bremi was roughly .95 to 1k! I'm using the proper H9DCO non-resistor copper core plugs and I put the Bremi wires back on. Taking this a step at a time so I know what the problem was once I get this fixed.

All of the plugs looked good, a few had some buildup likely from burning some oil but nothing drastic. Number six however, was wet and smelled of fuel. What could be causing that? Bad spark? Bad injector?

If the stutter at idle doesn't go away I'll be inspecting the distributor and rotor next, again, installed when the plugs/wires were installed roughly a year to year and a half ago.

Any ideas about the wet plug? I'll also note that it showed carbonization right up past the threads onto the body of the plug! It was in there tight however so I'm not sure how that happened. Again, any ideas or suggestions much welcome. I might just replace all the plugs but finding the correct H9DC0s was hard enough the last time.

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1992 190e 2.6