Need help with missfire under load on 340

Pulled all the plugs and you can tell its running rich which is no surprise because it always has, but i noticed that the plug from number 1 had a crack on both sides. I split the porcelain off where it was split and it looks clean, no carbon tracking.

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Well! There's a secondary failure if I ever saw it. lol It just "might not" carbon track if the path to ground was a REAL goodun. You know. As in LOW resistance? LOL