So since the PO didn't drive the truck much, and I managed to pull the boot off of the coil wire, I've decided to do a full tune up. I mostly had questions about brands recommended, i.e. napa oil filter vs genuine vs other, etc.
Plug Wires (currently rists suppression 1515 OEM?)
Also, I want to switch to 0w40 or 10w40 high mileage mobil 1, and my dad who was a classic car collector used to swear by marvel mystery oil in the oil pan for ~1k miles to clean things up, thoughts on adding MMO to current oil, running a bit then changing out for Mobil 1?