First of all thanks to everyone for helping me with past boat problems. Now I have a new problem(s). My boats rpms are jumping around at wot, almost like it hesitate then takes off then hesitates, does this the whole time at wot, from idle to full throttle it takes off awesome. But half to wot it skips around, it has a 17 pitch prop on it but runs to many rpms about 6200 so I'm only running about 3/4 throttle thinking a19?also the cavitation plate on plane is still under water when at wot not much but you can't see it. Any thoughts? Motor is a1150 mercury a 1976 its on a 1978 ranger aztec 17ft I can not raise the motor on the transom anymore so I am thinking of needing a jack plate.