My truck just started sputtering

its a 1995 chevy cheyenne. I don’t know where to start. It starts right up but it drives like crap. I’ll change the fuel filter tommorow and see if it help but if not, what could it be. It picks up speed, doesn’t turn off but its at a constant sputter. Its similar to old carburated cars when the carb takes a crap. HELP ME!!!

Oh. I forgot to mention that it just got a tune up about 2000 miles ago.

PROBLEM SOLVED! A distributor cable was making contact with the manifold, got burned through and was screwing everything up. HA!