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Hello. My name is Tan.
Could I get the engine serial number please?
When running the engine and you throttle up choke it. Does it run better?
If no change squeeze the primer bulb real hard when throttling up. Does it run better?
Have you done a spark and compression test yet? If you have no spark on one cylinder the engine can still idle but be low on power. If compression is low on one cylinder it will be low on power.