On a 1997 5.9 Cummins engine, the idle adjustment is typically located on the injection pump, specifically on the throttle linkage. Look for a small screw or knob that can be turned to increase or decrease the idle speed. Unfortunately, I can't provide pictures, but you can find detailed diagrams and images in a service manual or online forums dedicated to Cummins engines. Always make sure to check the manual specific to your engine for exact locations and specifications.
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