Sounds like a fuel issue, clogged filter or water. I would check the air filter and clean/replace as necessary and replace the fuel filter. If you have a water separator I would maintain it also. Good idea to fill your new fuel filter with fuel prior to installing so that you don't lose prime.
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Jon & Chris Everton
1986 40' Dog House #86
0 hp 8V92 Allison HT740
Soon to be 500hp ISM with ZF 6 Speed
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