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Bulldog, You probably already know this, but at the risk of sounding too simplistic, here goes. Spark plug fouling is caused by incomplete combustion inside the cylinder. That is usually caused by oil or antifreeze entering the combustion chamber. As soon as the plug begins to foul a little bit, it gets bad really quickly because then it also has unburned gasoline on it. I think if I were you I would go back to the old compression check thing. It's painful to do, but you might want to run the engine til it's hot. Turn it off, carefully remove the spark plugs since they'll be as hot as you know what, and run a compression check while the engine is hot. You might also watch the flow of antifreeze in the radiator while the engine is running hot. If it has bubbles in it, that's not good. It's usually a sign that exhaust gas is getting into a water channel somewhere in the engine. Like maybe a blown head gasket, maybe? So anyway, it seems to me that you want to see if water or oil is getting into your combustion chambers. By the way, when two adjacent cylinders are fouling, it is often a blown head gasket in the area between the two cylinders. Good luck, Tom
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