Intermittent issue of spitting, sputtering and shutting off

Sometimes the truck runs fine and other days it act like is starves for fuel will cut out, spit and sputter and sometimes shuts off. Sometimes wont but runs really bad. Has the fas fuel. We have change the filter, ECM everything and it is still doing the same thing. We don't know what else it could be. Also sometimes the check engine light will come on and he will get codes about failure to communicate to the computer.