ASEguy: the exhaust job was already done when I bought the truck, so I do not know if any of the problems coincided with that installation.
I nosed around under the hood a little more and noticed a couple things:
1. The air pump system is disconnected; bolts broken off where EGR pipes attach to manifolds, etc. Also sounds like exhaust manifold gasket leaks. Not really surprising, since manifold is missing one of the bolts that holds it to the head. Maybe this is the cause of the O2 sensor code?
2. What is the item in the picture? What does it do? Why would someone have removed it? It is located in the rear of the passenger fender, near the firewall. It's vacuum related, but I have no idea of it's function beyond that.
I think I'll start with a tuneup, because I have no idea when it was last done. Also plan to check lines/hoses for cracks, leaks, loose connections, etc. Maybe pull the throttle body and clean it out. Possibly something got gummed up/stuck because it sat for a couple years? My ex-FIL has a fuel pressure tester, so I can do that too, although I don't think that's my problem.
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