Hi, looking for suggestions/thoughts. Own 1993 Mercury 150 hp XR6. Bought new in fall of 1993. Have never had any problems with motor until last trip out. Motor started as usual, warmed her up for a minute or so idling, left dock, had boat up on plane with WOT, we were in a hurry 
, traveled for approx. 5-6 minutes then engine started to stumble on herself and died. To shorten story, motor starts fine, idles beautifully, revs without any hesitation - have 'hot foot', primer bulb stays hard, but motor will not run under power/load. The fastest motor will run under load is maybe 2 -3 mph if. Any more and she dies. Looking for suggestions to problem and how to test for same. Thanks in advance for any help and or thoughts.
, traveled for approx. 5-6 minutes then engine started to stumble on herself and died. To shorten story, motor starts fine, idles beautifully, revs without any hesitation - have 'hot foot', primer bulb stays hard, but motor will not run under power/load. The fastest motor will run under load is maybe 2 -3 mph if. Any more and she dies. Looking for suggestions to problem and how to test for same. Thanks in advance for any help and or thoughts.