check all of the connections/linkages. on my dad's 84 this same thing was happening and we found that it was due to one of the arms kept coming off of the butterfly. therefore the choke wasnt operating correctly and the thing would constantly die when cold.

once we figured that out, then it was getting horrible mileage and ran like poop when warmed up, only to find the linkage that held the choke open when warm was also off.

fixed both of these issues and now she runs like a champ. <img src="/forums/images/graemlins/smile.gif" alt="" />