For starters it's pretty cold where i live,
I left the block heater un plugged for about five day and went to start it and it would crank but not turn over , after a few hour of trying it would start to turn then kind of sputter, I eventually got it to start ,and it was blowing a good amount of black smoke for a minute, then went back to white smoke, I drove it around for a bit, and everything seemed good so I parked it and plugged the block heater in, and dint drive it for a day. Today i tried starting it again and its the same thing all over again , except there was no spuddering, or almost turning over any help is greatly appreciated

 

I assume you mean it would crank but not fire? 'Crank' and 'turn over' are synonymous terms.

First thought is, most or all of the glow plugs aren't working. That would do what you describe in cold weather, especially if the block heater hasn't been plugged in. If the block heater has been on for at least a couple hours, it should be easier to start, but with enough dead glow plugs would still be very difficult. My 6.2L (same basic engine) is noticeably harder to start in cold weather with only one dead glow plug.

 

are you getting a good glow plug cycle and are you getting afterglow? mine in cold weather lasts a good couple minutes then 30-45 seconds of afterglow once started you get a boost with the glow plugs.