honestly, imo - pentastars… v6's (i used to have a 2.7 as well) are quite popular for misfires/cylinder head issue. did you check for codes? im not sure.. i'm new to this charger game.. but on a maggie i could do the key dance and get all the trouble codes. also what spark plugs do you have? and your PCM would most likely not be the issue in that case….. i shall do some investigative work
most importantly… what are the codes and how do you know it's a misfire and what cylinder's misfiring?