Cylinder not firing
Hey guys I have a fresh build going on. Pulled an L76 from a running G8 and swapped my V6 G8 with the new powertrain. While the engine was out we did a cam and stall converter then put her back in. Now that the car was going to be tuned after startup Cylinder 1 is not firing as it should. We tried changing plugs, wires, coil packs and injectors but no matter what combo we used Cylinder 1 remained the problem. Note the engine bay harness came from a crashed vehicle. Any ideas or help would be greatly appreciated!
2009 G8 Base (GT swapped)