Ok- so the engine runs good, but not great. The symptoms are- it runs better after getting up to temperature, and between 2600 and 3000 rpm it kinda runs rough/ sputters until after 3000 rpms.
So after cruising the internet- I came upon the likely culprits- (in order of popularity)
1 O2 sensor $45
2 coolant sensor (the intake manifold one - not the temp guage one between #1 &3 cylinders) $17
3 Throttle position sensor $44
4 map sensor $??
5 electronic ignition timing in the distributor cap $80 is the cheapest I've found.....
6 timing, timing chain, vaccuum leaks, wires, plugs, clogged fuel filter, fuel pump, fuel
regulator, clogged fuel injectors, blah blah blah.
too many parts- as simple as this fuel system is- the K.I.S.S. principle does not apply.
So I started on #1 and 2. The revving problem went away almost immediately.
I also turned the timing up a few degrees which also helped- although after 3700 rpms there is
a little bit of popping coming from the passenger side exhaust.
I am going to change the thermostat to a 195 stock because if the engine doesnt get to temp the coolant sensor tells the computer its -40* outside.... duh
The original coolant sensor tested good- so its a spare.
The jeep now has more power and will do a powerbrake burnout.