I am having lack of power on my 6.0 and I am getting cyl 7 balance/contribution DTC intermittently and cyl 1 same thing every now and then. I have no smoke from the exhaust pipe. It passed the injector buzz test and the turbo is fine. I added 2 bottles of REV-X to the oil and it didn't help. I was wondering if I need to check FICM voltage first and go from there. I don't know if its the fuel pressure, FICM or HPO problem. It seems lazy till the turbo spools and it just lays down after 2000 rpm. Any ideas appreciated.