I have a 01 60hp mercury pro series oil injected outboard that bogs at full throttle. Ides n runs good but when at full throttle she will bog down to a slow wake after a few minutes 5-15 she will sometimes accelerate for a few seconds then bog again. If I turn her off and let her rest for 5-10 min she will be normal for a few min then bog again. I have changed the impeller still ssme results. Water pump is good. Changed fuel line from tank to engine. Still same results at full throttle.