Update..
I took the valve covers off, ran a compression test, 4 cylinders had ZERO compression.
So we took the heads off, found burned valves.
Did a valve job, ended up being $600, not including the gaskets. In total, it was $800 to repair, not to mention having the car towed to the Auto Hobby Shop on base.
After we put it back together, I tried to set the timing but the pointer is missing! Instead, I just advanced the timing until the engine starting pinging, then retarded it just enough to get it to run without knocking.
Long story short, the 800 runs better than she ever has in the year I've owned her. Now she feels like she has power!
