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I agree with SupraFiend I had almost the exact same problem with my white 85. I can only think of one other reason besides BHG you would have coolant on your spark plug would be a cracked head (lets hope not) and it leaking coolant into the cylinder. Unless you have a broken/damaged coolant line spraying coolant on top of your spark plug vally but that would mean 1 there is coolant all over your head and you would probably notice and you whoul also have a bad seal with the plug in that cylinder.

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