21foot 216ssi 2000 chaparral 5.7 tbi Volvo 1:43 gears. 14.5x19 pitch prop. I can only hit 4200 rpms at WOT trimed up a quarter of the way at 47mph. Full thank has 58 gallons 2 people on board. I even installed a second tac to verify rpms. And have been threw the intire ignition system and fuel...