my truck hiccups going down the road

Hello Frank, Unfortunately, the only good advice I can give to you is to have your truck diagnosed by a qualified repair shop. If I was going to "guess" I would guess that you're losing electrical power. Possible from the ignition switch or poor connection somewhere in the electrical system. More information would be needed and have the vehicle here would be key. When you say Hiccups, do you mean that the engine stalls? I would make a list of everything that cuts out and find out whats in common with whats on the list. Try and see if I could duplicate the issue with the engine on and parked while I wiggle wiring, major grounds and connections related to those componets.