Most likely the main jet is blocked. Remove ALL gas from the tank first. Look on the very bottom of the carburetor. Loosen the hex head bolt and drain the rest of the gas into a small container. Now remove the entire bolt. Try not to disturb the bowl itself. The jet will look similar to these, but will have a center hole. That must be cleaned out with cleaner. Reinstall the bolt and washer, and don't overtighten it. If that fixes the problem, great. If not, you may have to remove and clean the whole carb.

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I don't know if this will solve the problem or not. I had a Toro mower thst did this and the carburator float bowl nut fuel ports were clogged. There are 3 small ports that can be cleaned out with a pin. Another solution I've found is the fuel screen inside the gas tank (located in the fuel line port at the tank) gets clogged or slow and doesnt deliver fuel properly. A clogged vent(s) on a fuel cap could contribute to the problem also.