I would suspect sticking linkages. Spray all the linkage, especially on the choke side with penetrating oil and work it all back and forth.Make sure you engage and disengage the choke linkages manually through all its functions. Then spray it all down with a good lubricant like white lithium.
If you have the vacuum and heat operated choke then quite often that will gum up. Take it apart enough to get the piston out and soak it all down good with penetrating fluid.Wash the piston off and slide it back together. When it slides in and out easily, then give it a quick spray with lube and put it back together.
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