When was the last time that the fuel filter was changed (should be 2) one on the motor canister style is also the water separator and one on the stringer old metal style found on old trucks and tractors. Normally if its spark related you will get a rough idle along with cutting out at high rpm. Starving a motor of fuel is a high rpm thing. Cap, rotor, plugs, wires should be done every 100 hours. Fuel filters should be done every year with you oil change. Also use a fuel preservative such as stabil to prevent fuel in the system from turning into varnish in the off season.
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