challenger1800vt

Earlier this year took it out and did fine.
Today took it out and the passenger side engine is acting strange..

Take off is sluggish.
First of all..The engines rev normal when starting and sitting still.

When starting to give the engine some gas the engine starts to rev correctly about to 4700-5k rpms(but takeoff is still hurting), then the engine JUMPS to 7200, sometimes almost hitting rev limiter and bouncing a little. Even when the engines are running at about 7k (which is where it generally runs at top speed) the boat only gets to about 40mph. Which is about 10mph less then it generally does, and takes twice as long to get there. I have changed the sparks with new ones, Made no difference. I looked under the boat to the impeller and it looks good, i also looked from outside and it looks ok too.

The compression in all engines are the same as when i bought the boat and the same as when it was running good.


Any suggestions? There is not really a mechanic around to check it out.