passenger side cherry red manifold?
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"the back of the pssgr side exhaust" a misfire on #6 or #8 plain and simple.
No need to complicate it.
If you can't spot anything obvious with either end or with the insulation, replace the #8 plug and wire. That will probably fix it; if not, I'd say it's a toss up of:
1. the #8 connection inside the Opti
2. #8 injector dribbling when it's supposed to be closed (would be most noticeable at idle).






