Let me first begin by saying I know little to nothing about the mechanical side of engines so speaking down to me will actually help. I have a 1997 75 hp Mercury that ran well at the beginning of a week long fishing trip but began vibrating excessively when attempting to throttle up. The engine would vibrate/rock front to back. It seems to run fine at low rpm's and actually seemed to run fine at the end of the week. Thanks in advance.
