won"t stay running

i had the same problem with the same engine and all, in the end it was water that was in the carb cause it was old and wasnt maintained by the person i got it from so i needed to have it rebuilt. mine wouldn't wait till she warmed up though, if you weren't giving her constant gas then she would run for a few seconds and then die like a camel with no water in its hump on a dry day.