This is a 4.0 out of a cherokee I put into my 84 CJ-7. I have a crank but no start (spark) problem. Have replaced CPS, Cam sensor,and coil and still no spark. Hate to keep throwing parts at it but not sure whats left except the ECM. Ran perfect for six years then just quit one day while taking dogs out for a run. The ECM will throw codes so I know its not completely gone. The company I bought the engine wiring harness from (Hesco) said an ECM from a 91-95 cherokee or wrangler (not Grand Cherokee) would work and that manual or automatic makes no difference, but what is in this rig is an AX-15.:doh: