96 4.3 V6 Rough Idle

I got a 96 S10 with the Vortec with the central multipoint fuel injection ever since i got it has had a rough idle. i have put a new Fuel Filter on and ran injector cleaner through it. i plan to change spark plugs, wires, and distributor cap soon will this fix it? if not could you please tell me what would.
Thanks!