Stock.....hmmm well if they are black those two cylinders are running rich or oil is getting past the rings to them, are they wet or just black and cruddy. What do the other plugs look like. It is weird that it is the front two cylinders, what do your wires look like on those cylinders. I am not a fan of Platinum plugs as they do not conduct like a good copper plug. Try swapping to a set of Autolite AP25's for the stock heads gapped at .053. You could also do a compression test to see what condition everything is in, that would be good to know anyway.
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