Crank the motor first part of the day it will take off and run fine after fishing a few spots ill crank it up it starts idling rough and want run over 2000 rpms just plows the water and out of nowhere it will take off like a rocket and run strong and then sometimes it will b going along and then start skipping and start running rough and want run over 2000 rpms let idle for a few and it will take it off again plus the tach is jumping all over the place even when its running good need help plz