Problem with 1969 Johnson 9.5

Hi everyone, first time posting here and I need some help
I have a 1969 Johnson 9.5 on my 14' aluminum, normally this motor runs flawlessly, but yesterday after running for about 2 hours, mostly trolling but also at full speed it stalled on me, took me a few tries to get it started again then it would only run a little above idle speed even with the throttle wide open.
I thought that it may be a fuel problem but I had a full tank of properly mixed fresh gas.
Any suggestions of where to start trouble shooting this and what to look for would be greatly appreciated

Thanks in advance

Mike

How old are the coils,points, and condensers in your 9.5? How do the plugs look? If the plug(s) are wet and fouled, you have an ignition issue.
Something else to check would be the carb/ mag. sync. My Evinrude 9222 couldn't get out of its own way, before I reset that.

Thanks, Tracker1436,
I won't get a chance to look at it until the weekend but I will check these things then