why and what can i do to fix it
Year? Miles? Oily or fluffy carbon?
1988 t-bird 149000 miles no loss of oil.dont know a lot about cars.whats fluffy carbon
Can you pick your fouling out of the line up?: http://www.aa1car.com/library/reading_spark_plugs.jpg
Also, are all of the plugs fouling equally, or does one or more seem to be worse?