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I have .a 2000 250 ox66 that is fouling number 1 and 5 plugs every 4 to 5 hours of running time.since problem started i have replaced many parts to try and correct this problem and also several parts for general maintenance as the engine is around 1,000 hours.these parts include o2 sensor,l/p fuel pumps high pressure fuel pump stator plug boots (found one out of range) had injectors cleaned & checked .the problem stated after last year had small amount of water on # 2 spark plug and pulled head and found head gasket was erroding where fire ring and fiber part og gasket meet.at that point replace both head gaskets and since then no problem with #2 fouling.i would appreciate any help with this problem (i know this engine is 14 years old with fairly high hours but still runs perfect otherwise.thanks