Bad miss on start up

I have an '88 Cadillac with a 307 and 2-barrel carb. If I start it when it's cold outside, it misses terribly for about a minute, and then smooths out. Cap, rotor, plugs and wires are practically brand new, and it's not the choke as I have tried keeping the butterfly open and holding it closed, each produces the same result. Any advice or ideas would be appreciated. Thanks.

Wooz

I Had A 86 Fleet Wood And It Did The Same And I Found Out It Was The Choke Try To Spray The Carb And Links With A Cleaner And Then Spray With A Lube See If That Works And If It Dont Then Email Me A {[email protected]} For More