With power on it, there will be no choke plate movement - power heats the bi-metallic element in the housing, which opens the choke plate fully. You have to adjust it with no power on it, so the bi-metallic element is cold. Move the housing one index mark at a time until you get the choke action and fast idle you prefer cold, and check to make sure the choke plate is fully open after a minute or two with power on it (it needs a full 12 volts from an ignition-switched source). Don't power it from the coil (+) terminal, as that's only getting 7-8 volts except when cranking.
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