I put the jet in the water for the season and it ran sluggish. I thought it might be bad gas and ran it for a few days. it never got past 5000 rpms and 30 mph. When its on the ramp flushing out, it sounds great and the rpms rev to 8500. However once I put it back in the water its now making a loud high pitched sound and vibrates a little more. I put my hand underneath and didnt feel as though there was a blockage. I still cant get it past 30mph. Any suggestions would be much appreciated.