Hi been trying to diagnose this problembut can't seem to figure it out I have tried changing out the pump and imPeller, switching out the intercooler, and its not working. the ski has full boost 10 pounds but will only get up to 6400 rpms max after holding the throttle for one minute it starts to drop down into the 5000 range. I have good compression in all cylinders and put new plugs In as well.