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Re: 1990 4.0
The 1990-down L.O. 4.0L's (87-90) use a different cylinder head/intake, and ECM than the 91-up HO 4.0L's. 91-up 4.0L intakes have raised intake runners. Depending on what head/intake you are using will determine what your next step is. I've seen H.O. motors use L.O. intakes/ECM's successfully...Need more info and pic's from your end...
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89' YJ Sahara Project
94' YJ
98' TJ
99' XJ
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