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My old RV (1994 F53 with 53k) developed a little random miss at part throttle, so I pulled the plugs. Number 3 cylinder seems to have an issue. Number 7 plug was the best of the bunch and all but #3 were similar. All were gapped at .045. Number 3 seems to have gotten very hot and is significantly discolored. Also sooty. What would cause something like that.
I replaced them with Denso 5025 "U" groove. Thought I'd try something a little different. Interestingly they are pre-gapped at .033, but the bottom of the groove sits around .050.
Curious to see what the community has to say about all this.
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