No crank, gauges and radio not working, code P0449

Will not crank. I was driving one day when all of the gauges started jumping up and down then eventually stopped all together. Next the radio would turn off and on now stays off. It was cranking and starting occasionally then would shut off after a few seconds then eventually would stay running until I could get where I was going. Sometimes blower motor for a c would stay on after key was turned off. Have had evap 0449 and ops codes. Also, key immobilizer has shown up. Have relearned key gotten rid of that code still problem persists. Have fire to starter when manually jump in relay holes at fuse box. Replaced the fuse box, sn switch, ignition, cleaned all grounds all hot cables and say to have 12 v and continuity to everywhere I check. What's wrong? Could it be computer? I've tried to trace all wires, and have found nothing.