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Tom's right again.
Try removing the jets from the carb and spray carb cleaner through them, blow out with compressed air and then repeat 2-3 times. This will remove any build-up. Reinstall and test. I've seen this happen many times.
To complete this work, you do not need to remove the carburetor (if it is a Zenith) from the manifold. Just remove the lower section of the carb to gain access to all the jets. While you have it apart, remove and clean the brass well if it is a Zenith.
Good Day!