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[T3] pop-out


driving along today around town, all of a sudden the car goes pop, and sounds 
loud and rough.
turns out it blew #4 spark plug out of the head. this is a plug that had a 
threaded insert on it. i managed to put a new plug in with a new threaded 
insert on it (last two threads were serrated to help keep it in there; old 
one was plain). i'm obviously not very confident that this will last very 
long (it lasted a 35 mile low rpm drive home), so what should i do, without 
taking the heads off, or anything fancy like that? should i replace the 
threaded insert with a helicoil? would the head then need tapped?
thanks

sonny

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