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Has the PCM been updated to the latest calibration?
It adresses the hard start cold problem on most trucks,it sends voltage to both coils on the injectors to heat them up and get the oil moving in them,this a major problem in cold weather,Ford calls it stiction,this stops the injector from pusling and operating properly.
There is also a chance you have one or more defective injectors as the early 6.0l had a real problem with bad injectors after high mileage.
Most dealerships charge 1.2 hrs for a reprogram and it can only be done at a Ford dealer.PCM stands for Powertrain Control Module.The PCM on the 6.0l is behind the battery on the drivers side.The $9.00 is all it costs as an expert we get half of that.