1995 Chrysler Cirrus Question: My check engine light is on /has random misfire/idles rough/but runs great

My chrysler 2.5l has a random misfire. I replaced plugs, wires, rotor button, cap and even the complete distributor, i cleaned my injectors and replaced fuel filter, cleared check engine light and vehicle ran smoothly. crank vehicle the following morning and check engine light started flashing and then went solid. read codes and it still have a random misfire p0300. i dont know whats wrong.I read that this particular vehicle has a EGR issue. If I replace EGR valve would that possibly solve my probems. please help/advise