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Doesn't sound like an air leak. The diaphragms should be soft and flexible....guess you already know that. Seems like most carb problems are from the diaphragms getting old. Dirt in the intake screen could be a factor.

Skwerl is right, but why not make it a good time to learn carb rebuild basics. You will likely be glad you did, if future problems arise.

Have you taken apart the carburetor to clean it, and checked the gaskets and diaphragms....fuel inlet needle, etc?