I have a problem with my 94 7.3 DI, shortly after buying the truck it started acting up. It is VERY hard to start when cold, and when it does start it will die shortly therafter. now it is to the point of starting for about one to two seconds before it dies. Also when it ran it would occasionaly die for no aparent reason with no warning, and would puff smoke under hard acceleration as opposed to what they normaly do (a constant black smoke). I'm at a complete loss and would be very thankfull for any help!