looks to be some oil stain discoloration around the hex part of the plug. Was there any oil in the spark plug cavities? As mentioned above, this will most certainly cause major misfiring and eventually short out a coil pack. if the miss is there at idle, you can start disconnecting one coil pack at a time and sense for a change in idle quality. whichever coil you disconnect and there is no change, that could be your culprit. Sounds to me as if you do maybe have some oil that was in the plug holes. This would explain why after a long 125 mile drive, it developed the miss again. If there was any oil in the holes I'd replace the valve cover gaskets, clean the holes out really well, clean any oil out of the spark plug boots and then test drive it.
STETT Performance -
921 J Place, Suite 200
Plano, TX 75074
OEM Repairs and Maintenance
Extended Warranty Service
Everything Performance (brakes, turbos, Nitrous, Cams, Complete Engines, Clutches/Flywheels etc)
STETT Performance Official Grand Opening BMW Meet, May 6th 11A-3P -- Music, Food, Drawings and Tons of BMW's go to
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
and register.. it's FREE