I have a 2006 rxp with r&d nozzle, intake grate, wedge kit and cold air intake

but the rpm's just started to drop when i hit the throttle. Say i was going like a nice crusing speed like 40 the i hit the throttle and the rpm's jump at first then they drop like 500 when i start accel.

the other thing is that im starting to get about 6 gallons of water in the hull and when go to pump it out its is just about boiling. I think the thermostate is bad, but im not sure.
I was just wondering what you guys think.