I looked at a couple different places and the oldest I could find a Jet chip for is a 91.Also incase you didn't see my post in your general discussion thread.....all 4.0 engines are fuel injected but an 88 wouldn't have the high output head.
Transplanted '99 4.0, AX-15, NP231
Red Jeep club #8
Now belongs to my daughter.
97 ZJ Laredo
4.0, 42re, NP242
Marseilles Fire Dept:
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