Fuel injector problem???

i have an 89 xj w/130000 on her a 4.0 with the aw4, new years day the thing died on me on my way up a hill it just kinda chug chug chug and died, then i let it sit tried it again it didn't want to run it just kinda idled like clug clug clug .....clug clug clug clug, and then it started to run fine so i decided to try it agian and it died and won't do anything but just chug, i just replace the iac thinking maybe, but that didn't help, i just put in a new tank, pump, fuel filter, cps, o2 sensor, coil, plugs (bosch, but ran fine for the last 14k), wires, rotor, cap. It always ran soso the whole time i owned it but lately it would give me little fits and then this, any help please this is my only jeep, my dad has a 93 xj sport and she runs beautiful compare to mine :-(