2000 Jeep Grand Cherokee Laredo 4.0l - PO202, PO203, PO204, PO300, PO303, PO304

I'm at my wits end with this thing. It started running rough at idle only. I changed plugs, which looked ok but changed them anyway with proper copper plugs (these cars are notorious for running badly with platinum). No change. I ran fresh fuel with injector cleaner. No change. I put in a new ignition coil. No change. I replaced all of the injectors, even though they all read 13.2 ohms and checked with a noid light. No change. All the wiring looks ok. One interesting thing: PO202, 203, 204 came up after changing the injectors. Before that I was only getting PO300, 303, and 304. Does this mean a new PCM is in order or is it something else I may have overlooked?