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With the engine off remove the air cleaner and look down the primary throttle bores using a bright flashlight. Operate the throttle by hand while you watch for two strong streams of fuel emanating from the accelerator pump nozzles. What did you see occur?
Vacuum or mechanical secondaries?
Where is the choke in all of this? It's supposed to keep you out of stuff like this... Is is working? In BRRRRR cold like that it probably needs to be adjusted to a more advanced or positive setting.