Sounds like you’re right on top of things. Not everyone can diagnose and find the shortest route between point A and B. In your place, I would still swap the the coil pack from number 3 with a known “good” coil pack. If there’s anything wrong #3 coil pack, you’ll know real soon.
If you’re working on ignition parts, this is standard operating procedure if the engine is yours. If you were working on a valve train, such as the pushrod valve train in your HEMI, you wouldn’t want to swap any components around because once they’re broken in, they’re no longer identical and interchageable.
I hope to hear that everything is working out for you after you have completed the repairs.
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