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I also have a 1998 Jimmy.I have talked to several mechanics, and they have given me several different suggestions. 1. possibly vacum lines 2.fuses in engine compartment. 3.there is a vacum module somewhere,either under or behind the glove box. I am still pursuing this problem myself

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16y ago
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Q: Why is my 1998 gmc jimmy 4wd not engaging?
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