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Also, are you adjusting the choke so it is slightly open? & are your running manual or vacuum secondaries? If vacuum, are they closed completely at idle?the motor needs an enriched mixture when cold, not a complete choking. If you close the choke completely you shut off all air. Likewise, if your secondary butterflies were pulling open, which is doubtfull, you may be letting too much air in. This is where an Electric Choke is nice. You pump the pedal slightly to engage the Cam & start the engine. The electric choke, if adjusted properly, slowly starts to open. By the time Its open all the way your motor should be idling properly, with the fast idle cam disengaged.