Had this happen on my 08 Taurus X 248,000 miles, for a couple of days it did it twice each day. Third day it threw a check engine light and started missing when I was accelerating on the highway. Checked the code when I got home and it said cylinder 5 miss. Pulled the coil and it was destroyed with a bunch of crap down by the spark plug. Cleaned it up the debris, replaced the plug and put in a Duralast coil, total cost $61. Now no more issues, but it is the first day driving it, so time will tell. I will probably just replace all the coils now, especially with the mileage. Had put in new plugs 10 months ago and the coils all looked good at the time.
