Still down, transfer case doesn't seem to be the issue. After much searching, it appears as if my problem is very common.
Starts up great, idles great, starts going down the road great... then it bogs down and starts to backfire and won't go any faster.
However, if I reset the codes with the obd2 then it runs fine. This indicates to me it's an electrical issue.
Just in case, I changed MAF sensor, o2 sensor, fuel filter, new plugs, wires, distributor and rotor. This has to be an electrical problem since the problem goes away when reset. I'm going to have to dig through the rat's nest of wires near passenger front fender well and start testing them.
My capabilities are weak in this area, so it'll be a slow go.
I wish I could find the part number for that harness, might be easier.