[RABarrett]

The most obvious likelihood is that the choke coil is connected backwards, causing the choke to close when warm, not cold. It is also possible for the idle to be set fast, and the choke being inoperative, causing the choke not to close at all. Then the engine does not run until warm, when the fast idle causes excessive idling speeds. First check the operation of the choke, and fast idle linkage. If it works, you have eliminated one of the many possibilities. Ray