Have you checked the choke to make sure its working properly?
Do you have an electronic choke, or a manual one?
If your choke is sticking at or near the closed position, your carb will be
starved for air, and give you all the bad drivability issues you are describing.
When your Jeep is cold, the choke should close, and as your Jeep is warming
up, it will open slowly until it reaches its full open position.
If its not set right, or the choke pull off is not functioning correctly then
the choke plate can stay closed even after the engine has warmed up, and
the engine will not be able to get the right amount of air it needs.
Also, make sure if your distributor has a vacuum advance to it, that its
working properly, and that you are getting vacuum to it.
If your distributor is a mechanical advance, make sure the weights are
not stuck, and that they can move freely.
If your distributor is not advancing properly, that can cause off idle problems
Alot of backfiring problems are caused by a carb being out of wack, and
not set up correctly. Check the specs on your carb, and get a re-build
kit for it if its not in good shape, and out of spec for your Jeep.
Most times, a simple re-build with a $20.00 kit, and all the proper adjustments
are all it will take to get your carb functioning properly again.