Driving at freeway speed truck starts spitting and sputtering an loses power

What is your question?

When it started to spit an sputter i pull over an put truck in neutral and put petal to floor and it seems to blow out whatever is making it run like that but it will do it again down the road truck doesn't have cats on it its straight pipe from manifold to muffler

What makes this problem better or worse?

It clears up after i put pedal to floozr a couple of times it seems to blow out what ever is affecting truck

How long has your 2000 Dodge Ram 1500 had this problem?

It just started