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It’s rare but sometimes plugs just fail. I have also done emission tests on cars with over 250000kms on them that passed the test. Only to have the owners tell me to do a tuneup anyway even though the car ran great and passed with flying colours. Pull the plugs and guess what?!?! Near nothing left of the ORIGINAL plugs.
Sometimes you just get a bad one. Could have been cracked on install at the factory and the crack worsened to the point of failure.
Glad you got it figured out and good diagnosing.
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