318 Poly Vibration

Drained some oil into a glass jar, don't see water.
Started grounding each cylinder and there was no change. Recalled in my first post when I mentioned I had left a wire off in error, plugged it back in, no change.
Went to change cap for the heck of it, sent wrong replacement cap, cleaned up one on car, started, thought it was same or slightly better.
Started grounding on other side, no change, pulled wire apart w/o noticing. Went to put back together, thought this wire looks pretty dam cheap!
Wire on left extra from another set, strands packed, wire on right on car now, strand spread out under some back covering, destroyed on end. Rubbed my fingers on it and the strands were visible.
Think this could be the cause?

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