After Jason rebuilt the harness, repaired all the splices, and properly wrapped and routed the harness, it still had Code 42, which can be a whole bunch of things. Mostly sensors that had been replaced without improvement. We contacted Sinister Performance who did my tune and told him about the Code 42 headbanger. He sent a diagnostic tree and schematic for Code 42 and the Electronic Spark Timing. Jason verified everything was correct, but due to his keen observations, found that the six-pin harness to the ICM had a bad terminal. It can be seen in his photos on his Facebook page link, the very first picture.
