Yes it was the rearmost on driver side of course. Thread was so so and my friend tightened wrong last time. Started changing plugs today and it broke off. It looks like impossible to do anything there. What options do I have? In theory it should stay in place under most conditions. Anyone had this problem? Also any tip on taking coil screw on next one in front of that one? I have done this before years ago and I forgot. As you can see I am not having a happy day today. Tks