OK my bad here it is the troubleshooting charts from the FSM for bot the 4.0 and 4.2. This for no spark won't start problem. 7 pages long hope you can use this and follow it. Best I got.
89YJ 2.5L TBI, AX-5, NP231 SYE, Ford 8.8, Yukon Grizzly, Tom Woods Shaft, 33" BFG T/As, 4" lift, Warn VR10000s.
AF Jeep Club Tail #184