The boot looked ok, but I will check it closely for cracks. I had some place out East do the cleaning on my 3.0 injectors, and that worked out well. If the coil does not clear it up I could try some BG 44K on that theory. I had a nasty problem with an injector sticking on the Red Montero when I first bought it and that cleared it up. Seems like an injector would have to be awfully plugged to cause a miss fire though. Now, here is something else, seems like the plug was a bit whitish to me, indicated a lean fuel condition....so maybe a can of BG is on tap...