So I rebuilt my engine here a while ago and installed a new cam. The packaging said I required a different computer. So I got what was supposed to be A Mopar Performance PCM but I think I got ripped off because it doesnt make any difference between the stock one and this one. The engine tends to not stay idling properly and it has a misfire every once in a while while I'm driving. So does anyone know if it would be possible to put in a 5.9L ECM or if i got an ECM off of a newer model so it be possible to reflash it? Or if this would even make a difference?