Cold starts

[85Silveradoin04]

I recently installed a new vac sec 600cfm holley with an electrical choke. The carb has cleared up and confirmed quite a few issues seen with the old one (stumbling and hesitations). The only problem I seem to have now is with the cold starts. When the truck is initially turned on, it revs to 1500RPM perfectly. If I throw it into drive right away, it dies. It has been my past experiance that it is possible to throw a carbed vehical in drive RIGHT after you start it. Even if I feather the gas off the fast idle cam after 20+ seconds of idling at 1500RPM, it dies. Once it is restarted, its fine. I believe the choke takes 1+ minutes to completely come off. Now, if I waste more of my time and gas to let it warm up to op. temp, all is fine.


Any ideas?