hello all,i bought a 96 seadoo xp last summer ran great then i hit a snag.For about10-30 min of the first ride time it runs great no problem but after about that amount of time. if i go past 1/2 throttle it surges rpm.it will gain rpm then lose it.it does this pretty fast almost like it hitting a rev limiter but a little slower its hard to explain sorry.I have had the carbs off and cleaned them,i replaced the gray fuel lines, and i replaced the valve on the water box still does it can the vavle on the water box cause it to run bad?im asking because with the ski running water runs out of hte vavle were the lid snaps on and it pops the lid off.any help would be great.thanks