Got new wires spliced in and cleared the P0120 DTC. It helped, but did not cure the issue. The car will now run for about 10 seconds, before it dies again. It has an unsteady idle - it starts really high for a couple of seconds (more than the norm), then slows down and chugs until it dies. The check engine light is on, but there are no codes, and the oil level is fine. I did look for more bad wires, but haven't found any. I may just need to try to drive it up and down the back yard a few times to see if I can get a code to set...