So I'm breaking in my engine on a basemap tune and it's running rough and afterfiring. I pulled coil connectors and one of the trigger wires is shorted to ground. The rest of them ~33ohm. I unplugged the connector at the ECU and plugged it back in and low and behold it's fixed. Will it stay fixed? Runs good, afterfiring gone. I put a couple of hundred miles on it and all of a sudden it's doing it again. Same wire shorts to ground. Vexing.

Ideas? Find another 02 ECU and try that?

Ed