Holley 1945 /6 choke opening too fast?

My Duster has an issue when it's not either just started or over 70 degrees outside. It wants to stall out everytime I give it throttle. When I pull the air cleaner off, I see that the choke is open all the way. If I close it part way, I can get the engine to rev clean. Is this perhaps an issue with the choke spring? or is it common for the choke to be open completely shortly after starting the car?