I did take it back to the dealer ( the ones who did the intake gasket) - they say its not necessary to remove the plugs for this and they dont.... so they're saying they have never touched the plugs... when they first gave me the estimate - i was all over them about helicoiling it, but they insisted it was too far damaged - now this morning after my pressure to the service manager- he says they have a "special tool" that can replace the threads -"not a helicoil though" and I may get by with repairs costing only 400.00. Whatever.... I still dont understand why my spark plug would just all of the sudden blow out of the cylinder - I still say they removed the plugs to do the intake gasket, even though it isnt required to do so