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A broken piston ring could be your problem. Do a compression test or a leak down test to see the shape of the engine. Rick

Take the carb back apart and soak in carb cleaner to remove varnish. Check the position of the float. On briggs it should be parallel to the base when the carb is inverted. This is important .

Usually when they need to be choked to run, the carb needs to be taken apart and soaked in a carb solution to remove the varnish. Gas needs to be drained each year at the end of the season or varnish...

The carb will need to be taken apart and soaked in carb solvent. Install a new carb kit ,adjust to specs and you will enjoy the summer. Rick