Back in April I was having misfire issues on #6. BMW replaced all the plugs and injectors (I had already replaced the coilpack on #6). The problem went away for a short time. In the last few weeks I started getting some odd behavior. I brought it back in and was told there was still an issue with #6. End result, they are replacing the cylinder head. I should hopefully be getting my car tomorrow. Maybe after this fix it'll stay out of the shop for a few months