So, on the z4, I’ve been having 29D0 – combustion misfires, cylinder 4 errors. As you know, I got new index 12 injectors for the 335i. so I used one of the good injectors from the 335i and put it in cylinder 4. Had the same issue/error. So, I then swapped injector 3 with 4 but still 29D0 error on cylinder 4. I then swapped the coils from 3 and 4. Still the same error??? What do you think I need to do next?