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Here is where the fuel delivery adjustment is made. Turn the nut counter-clockwise to move the screw in to reduce the delivery.

This may be a long shot, but check your flame heater nozzle. Some leak and if it's injecting fuel into the intake manifold who knows what will happen. Engine runaway? Some 5-ton multifuel engines have solenoid valves shutting the fuel off to and from this flame heater nozzle, perhaps some deuce...