Running rough???

Sorry if this has been posted before but i have a 1992 dodge Stealth r/t. It seems to be stock, as i just bought it. but the harmonic balancer gave up the ghost the day i bought it while driving it home. i replaced that and i thought that would fix most the problems but it still runs rough. ive replace the spark plugs, the wires too and changed the valve cover gaskets has they where leaking. Ive even cleaned the throttle body. I am running out of ideas any more suggestions would be great.