I had the same problem at 35K. Turned out that the plugs had blown the seal between the ceramic core and the housing on all four plugs.
New plugs solved the problem. If you are in there...chang out the wires for some high temp 8mm solid coil wires(preventative for a common problem).
Since good old (and cheap) copper core Champion plugs are arguably the best that you can do.... change them at 25k and avoid having to write notes like this one.[8)]
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