The binding was the secondary lock-out cam. The high-speed idle lever was jamming up against it. I don't know what would prevent that from happening in the future, but it's good for now.
I sealed up a huge leak at the exhaust manifold and a couple of others where I spliced some new pipes into the old exhaust system just past the manifolds. WOW what a difference. You can carry on a conversation in the cab now!
Next trip is in October and I *think* I've knocked out all the mechanical stuff (knock on wood). I may get cocky and tear up the carpet between now and then. I want to put a floating vinyl tile floor in. But that's another topic....