Same thing happened to me sorta. 72000 miles and i figured i would change the plugs as they were ori. So i figured i go with bosch plantuim 2 plugs. I had a miss after that, couldnt figure it out. An old menchinic i know told me to put oe plugs back in, so i went to ford and got what they same with from the factory. Sloved my problem. Weird huh.