Hey guys could i get some advice? On Dyno testing a caterpillar C12 engine and every time I run the cutout test it fails the # 3 cylinder. The engine made required horsepower and all other specifications were met at dyno. I installed a new injector in the # 3 cylinder and it failed again. Replaced the engine wiring harness it failed again. I replaced the ECM and the injector wiring harness and it failed again. Then I swapped the # 3 and the # 5 injectors and it failed again. I reset the injectors setting each time I changed injectors as well. Overhead setting is fine. Any thoughts from anyone on what this could be?