Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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It sounds like the carburetor jet it partially stopped up. It is not getting enough fuel to run at a steady rpm without utilizing the choke a little bit to pull additional fuel into the carburetor. You will need to remove and thoroughly clean the carburetor jets which will solve your problem. If you need additional assistance feel free to ask I am here to assist you as much as I can.
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