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Hello. My name is Tan.
Try closing the choke plate will it idle down now? You have either an air leak in the intake or the carb is clogging up in the idle circuit of the carb. Have you changed the fuel filters?
Ok start engine up run for a few minutes let idle down till it dies. When engine quits look down the throat of the carb do you see fuel dribbling in the throat of the carb? Do you see puddled fuel in the bottom of intake when throttle is wide open?