any update on this james?
I'm having a similar issue w/ cylinder 3 but sometimes the CEL comes back and says 3+ cylinders misfire. It's only when it's below 60 degrees outside too..... Mine is a 2008 135i w/ about 35k miles on it. BMW did a 30k on it about 6 months ago, I don't know what's included in the 30k, but I can go back and look at my records, as I'm not sure if the plugs were changed then or not. Injectors were replaced right before that.