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I have a 96 GCL and it did the same thing and it was the catalytic converter. Which on the 4.0l it has been recalled. Call a dealership and give them your VIN and they can tell you if it has been recalled, if not a new stock one is only $40 at autozone.

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Q: What is causing vibration in 93 jgc during idle and not during driving and while at idle increase in rpms and the vibrtation goes away?
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