stalls out

I recently had the heads of my Mazda B4000 (94 Ranger) now its extremely hard to start when cold you need to madly feather gas and over rev until it gets warm then it idles fine. except from behind the passanger side head a white gas vapor pours out though Im unable to see exactly where it...

http://www.youtube.com/watch?v=PYEpb00ZtmM Please tell me what you think?!?!?! I need help with this and all these truck owners with a 2.3L generation 3 ranger!