Chevrolet Corvette Forum : “choke on a 78 vette”

depends on your linkage if you move the choke up does it engage?

It's very simple.  When ANY choke is on, whether it's a car or a lawnmower...the engine will start to run rough as the engine starts to warm up,as it is  still being supplied with extra gasoline (choke on),rather than a balanced amount of gas & air as the engine warms up(choke open). You can also look inside your carberator and see in the bore whether a metal flap is closing off the opening with the choke in the on position (chokeing off the air,you see)....
  So after a minute or 2,.. after the engine is warmed up,turn the choke off (or openig up that butterfly valve {flap} as it were,to allow more air in),  then all is well.