When I got the truck I picked up a new cap, rotor and plugs. I swapped the plugs out at the time, but the cap and rotor ended up sitting on the shelf. I switched the stuff out this morning. I feel pretty bad now for not doing this immediately, I don’t even know how it ran.
I’ve also resealed the thermostat housing/water neck - again. Filed the housing flat and am trying a paper gasket painted with Permatex Aviation.