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  1. greatbg

    Help fuel injection for a 4.2

    My friend has a 90 YJ w/ a 4.2 automatic. I have a 96 grand Cherokee with 4.0, fuel injection and auto trans. (bad engine) What I would like to do is swap all the fuel injection parts to the YJ. What problems will I face? Has anyone out there done this? Will I have to use the 4.0 heads? As...
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