Excellent instructions on removing the TB above, but I would check the fuel pressure first. Its easy to check and could cause the symptoms. I had the same symptoms on a different vehicle (not my Dodge) and it turned out to be the fuel pressure regulator. Being old enough to have lots of experience with carburetors, cold start symptoms being related to fuel pressure didn't make sense so I checked a lot of things before the fuel pressure which it turned out to be. Good luck!