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Like I said in my post, I took the plugs out (all 8) and they all looked great (light brown) with the exception of #1 and #7.
Ive ruled out all the usual suspects. I have 20 gallons of fresh gas in the tank (it was fairly low) and I added some "sea foam" to help clean things up.
I can try a compression check, but the engine barely has 10 hours on it since the rebuild and valve adjustment. The weird part is that last year, despite my bilge looking like the gulf of mexico, everything ran great. It hit hard on all 8, ran smooth and like a charm. I did not change anything initially and it started to run poorly.
Again, when I had the engine out of the boat the only thing I did was change the oil pan gasket and rear main seal. Everything else was like it was, and that was the real shame of it because it was running so good when I took it out.
Im thinkin about going ahead with the cap and rotor and seeing where that leads me.. crazier things have happened.. And an ignition related issue would really make sense because of the other 6 cylinders appearing to be just fine.