17083224 on a 83 chevy auto need help with adj fast Idle and idle

[bober]

I just bought this 83 1/2 ton and it has a 350 auto has had carb worked on ( rebuilt ) .On fresh 350 . Seems to run well but when cold start it idles and has a choke spring in the int. .  Where do I start with adj. the cold idle ? Thanks for any help

[Cliff Ruggles]

Need more info.

On a cold start do you have fast idle?

Is the choke hot-air or electric?

When you move the throttle on a cold engine does the choke flap snap shut and does the fast idle cam raise to the highest position?

When you say "rebuilt" did someone rebuild the original carb or is it commercially "remanufactured"? 

What is the carburetor part number?