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Beginning to appreciate your comment, but do you think these plugs are the problem or something else is going on?

Anyone tried Bosch "Platinum Plus 2" plugs in their '02 - '03 Protege 5 (2.0L) Its been an interesting weekend. Saturday night I had a spark plug literally pop-out of the cylinder head while on the interstate. The threads on the head and plug are fine and it appears maybe the mechanic...