Ok so this has just started. If it is cold outside and the truck sits for any longer period of time(1 hour+) when I start it back up its hard to start(takes longer) and when it starts it stumbles and white smoke comes pouring out of the exhaust for about 20 seconds and then it clears up and isn't stumbling anymore and there is no more white smoke. I've been told it most likely injectors and glow plugs. Your guys thoughts?

Check the Glow plugs with a meter, I don't remeber what the ohm's should be for good glows, but if you do a search for something like "testing glow plugs" I bet you'll find a ton of stuff.