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Almost certainly a carb problem. It could be as simple as a plugged passage or jet. Try a thorough cleaning with a can of spray cleaner - blow it into every hole, jet, nook and cranny you can find.

If that doesn't help, you might have a bad accelerator pump. When you push the lever, it should spray fuel into the carb venturis. If it doesn't spray, or doesn't spray into both primaries, it's probably a bad diaphragm.

More details about your carb setup will help with further suggestions...
 

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Me too! I was just out there going over a few things tonight. I replaced the cap, rotor, plug wires because I heard a light snapping sound like a spark when it was running at idle. Turns out my spark plug wires were arcing and misdirecting spark. It is much smoother now and under load.
 
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