My car burns oil in 2 cylinders, and will foul a plug now and then, and when it does it sounds very similar to what is happening to you. It will come on over the course of a day, with the car running just a bit rougher, and then next time I crank it, stumbling, popping, etc all over the place. My first instinct would be to check the plugs.
Just my $.02,
Jorge
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