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I had this exact problem on my old 1GM (not the 1GM10) and I changed EVERYTHING, reset timing, adjusted valves, checked compression, clean prop, nothing worked. Finally hired a mechanic who pointed an IR thermometer at the exhaust and told me it was a partially clogged. I dont remember if I fixed it before changing the engine for a 2GM13. I even borrowed a strobe light to check the speed of the flywheel to make sure the tach was reading right.
The 1GM was just too small for an 8000 lb boat cuz it had only 6.5 hp.
 
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