stalls out at full throttle

by Mel
(new mexico)

2001 75 hp merc/mariner 4 stroke. starts up with no issues and will idle with no issues. gets up on plane and runs good for about 30 seconds then it starts to bogg down quickly and will eventually stop. bring back shifter to neutral position and it starts up with little hesitation. will run at half speed but stalls out again when going to full throttle. any experience out there with this issue.