2007 6.0 loss of power uphill, rough idle, then died

[Gig_em_05]

New to the diesel world, and this site, but have already learned quite a bit, and hoping to get an answer for my issue. I have a 2007 F-250 with 78K. I just recently had my truck in the shop (Champion Ford of Houston), after my truck died on me a few weeks ago. First shop (Randall Reed Ford) said two injectors were bad, as well as my HPOP, but I decided to go with a second opinion. Champion Ford said it was my FICM, EGR valve and fuel pump. Had them replace everything and do a de-carb service as well. Truck ran great out of the gate, but there was, and still is, a puff of white smoke upon acceleration after I stop at a light or stop sign (only after the truck is warmed up). Shop told me to "drive it hard" and see if it clears up. Well, last night I was driving home, being rough like they said, and when going up a slight hill the truck began to lose power. When I got to the light it was idling rough, and the power was lacking. Got into my neighborhood, and the truck died about 100 ft from my house. Let it sit for a minute and it started up. I was just above "E" on my fuel gauge, so I put about two gallons in, and it started right up, so I drove it to the nearest station and filled up. Truck is running great now, but I'm still scared to get too far from my house. White smoke is still there upon acceleration as well. The first time my truck broke down the fuel gauge was just above "E" so I'm wondering if that was my problem, or there is an underlying issue? Any insight would be helpful, as the dealership has no clue.