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when you say crust - describe it - what color?

It was like a brownish color. And I'm not saying like a fine crust. It was pretty thick. Like between 1/16 and 1/8 of an inch for lack of a better way to describe it...

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what did the 2 and 3 plug look like?

they had the normal light brownish look on the electrode insulator...

02 Ford F-250 4X4 PSD...zero body damage
67 Weimann 18' Jet boat...zero body damage except for the trailer drags on the ground from time to time