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The choke will cause more fuel to be pulled into the engine and restrict airflow at the same time causing a rich fuel to air ratio. If your engine is cold it needs more fuel than it does when it is warm. Check for vacuum leaks that can cause too lean a mixture even after engine is warm. Also check proper calibration of this mixture through the carburetor, jets, ventures, etc. (optimal 14.7:1 for gasoline at sea level).

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