I'm on a stock 2009 MT 335i with the stage 1 91oct tune (version 6.1). So I've been getting some intermittent misfires, specifically they only happen in 6th gear going up a steep hill under WOT around 85-90 mph. Tried a lot of things and took the car to a couple of different shops and still can't figure out what's wrong!
Replaced coils, plugs and rear oxygen sensor but the misfire is still there intermittently. Annoyingly when I went to log tonight, it didn't misfire a single time, maybe it was because of the low night time temps (60F in Cali). Thought I'd post the logs anyway, maybe you guys will notice something. I'm new to logging so I did a few, just in case:
3rd gear pulls (on flat ground):
Run 1
Run 2
Run 3
Here is a sixth gear pull going up a steep hill, where I tried to recreate the misfire:
Sixth gear pull