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I have a 2004 excursion 6L, It sounds like it is running on four cylinders. It has high voltage codes for cylinders 1-4-6-7 injectors. i replaced ficm and flashed and updated ecm. truck started but stills sound like it is running on four cylinders, It blows heavy white smoke out tail pipe. Replaced all four injectors and programmed injectors. runs exactly the same. inspected all harness areas, no chaffing. Lost
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