the dealer told me it was most likely the egr valve but i can hear it opening and closeing throhg the exhaust and yes it sounds like it isnt running on all 8 and it is doing it constanly my thouhgts are the FCIM or an injector(s) what misleads me is that there are no codes which to me means it is probably a mechanical issue not electrical and i have no smoke and a very little loss of power not really enough to say so
