Hey guys just trying to get my MM running better

Ive been driving it around and most of the time there isn’t a problem. I reach speeds of 65-70 no prob, BUT there has been times where I’m driving on the highway and in the city where the truck somehow cuts the flow of gas and turns off. it starts right up no problem but then it’ll do it after again and again.
Not sure if it’s a fuel problem, or a spark problem

I’ve replaced the fuel pump and filter, new spark plugs, and wires

thanks in advance