That stuff was soft. Before the overheat, the plug in #7 would always have gunk on it. I figured it was some build up in the chamber that would eventually burn off. Also, the water theory makes sense as the plug was hard to pull out of #7. It had a slight bit of rust on it, I thought it may have just been from a splash of salt water getting on it a while back (the trans cooler intake hose had a small leak and I had salt water entering the engine area, had to limp home)


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