1995 Dodge Ram keeps dying

I have a 95 dodge ram, I put in a new fuel pump and cleaned the tank, checked fuses, and ran injector cleaner thru it, but everytime I take my foot off the accelerator at slow speeds it dies, or at a set speed say 60mph it backfires and dies or is left to idle for 10min or so it dies, I dont know what to do, when at slow speed when I take my foot off pedal the rpms just fall almost to zero sometimes the come back up most times it just goes dead