I think tomorrow I'm gonna go do a general tuneup. I've yet to check the plugs/wires/oil/etc. And I need to use up my can of seafoam. Anything else I should check out?
Change that gear oil in both, front and rear diffs.
85w-90 Gear oil.
Also buy a new PCV valve or clean the one you have. Also clean all the PCV hoses, I will suspect them being gunked up from old oil over the years.