Re: Need HELP!!!!!!!!!
Start with the easiest - in my time as a tech I've gotten brand new coils, out of the box, that were bad - try swapping that coil with a known good one, see if it still has a miss.. If it does, and there's no circuit codes stored (IE if there were a wiring/connector issue, it would show a code for that coil..)
Ditto what hottcobra said.. Regardless if it looks like something hit the plug.. something closed the gap, so there was some sort of contact somewhere.. A closed gap on a plug in the regals like mine is a sure sign of a chipped piston (hypereutectic... HARD but brittle, just takes some spark knock) and if I remember right Ford left out the knock sensors on the 99+ mustang GTs.. While you're probably still naturally aspirated, a lack of fueling could definitely cause detonation, audible or not..
If you go ahead with a compression check, let us know what you find out.. Could be a broken spring/etc...
2012 IS F Blue IS F Sport
2006 Mustang V6 wannabe