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Another modification I made was adding a 190 degree thermostat, after this change is when I noticed this issue, vapor lock possibly? Once the engine cools down it will run good again for awhile.
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That would be my first thought as the THERMO is too hot for the engine. It is meant for a late model emissions engine.
Vapor lock, gasoline phase separation and boil-off.
What engine does it have? Mechanical choke?