Need help diagnosing a problem.
 

Last night I made 200 something mile trip and on numerous occasions on the way, keeping my speed at about 70 the whole way, the truck wanted to bog down and sputter and have no throttle response. I would let off the pedal to slow down and it would go away. Please help!!

low fuel pressure??? have you replaced the fuel filter lately?

Was just replaced about 1500 miles ago.

air getting into the lines or if the lines are collapsing it will do the same thing. if you have any old, cracked or dried up fuel lines you can try and replace those and see if is solves it.

also the fuel filter housing, bleed screw, primer bulb and water drain are known to have issues and let air into the fuel. by replacing a section of hose after the filter with a clear one you can see if there is any bubbles in the fuel

I know all, I think there is six, fuel lines that are right by the fuel filter were changed the same time the filter was. Installed a lift pump and I guess the extra pressure blew those lines apart.