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This same thing happened to me, it should not have separated and I was really trying not to break it, next time I'll use a heat gun first.
What led me down this road was after driving in a rain storm at highway speed, I developed a miss/ breakup at higher RPM. Inspection I noticed that he rubber covers on one of the connectors was split from (heat/steam?) replace both w/ new. Figured they got wet, IIRC I did the coils too just in case.
No more ignition issues after 4 years.