truck runnin rough

hello all my truck is a 91 nissian pickup it started running rough and would smooth out for a little while but go back to runnin rough it will do this all the time. other info i just changed the fuel pump 2 days ago, also changed the fuel filter, and plugs. thanks in advance for any help or advice that anyone can give me

you sre you don't have a vaccumm leaking? another thing you never replaced plug wires i'd try that if you don't have a hose leaking. last thing did you put ngk plugs in that?

no i put bosch plugs in it, i hadnt thought about a vaccuum line thanks i will ck that 2 morrow gonna try a new fuel filter also, thinking maybe when i changed the fuel pump maybe some trash got through, thanks for the advice