ive got an 05 f250 6.0. the other day i took the truck and had the oil changed and fuel filters changed. it ran fine for the first 50 miles or so then every now and then when i step on the accellerator its stumbles and sometimes it loses all power, the engine starts pulsing and it blows blue and black smoke. if i pull over and shut it down and restrt it it runs fine.
ive been told it is air in the lines and just needs to be ran to get it out just wanted to hear some other opinions.

 

water in fuel? clogged fuel filter?