Sudden Gain

in the range of 50 to 55 mph, I get a pulse of power on the tach and rev felt from the engine.....just a degree or more worth.....the tyranny doesn't shift, just this mysterious rev....my other says it feels like we are running out of gas...any ideas ?? 2001 WJ .... straight 6.....4x4 ...120,000 miles...

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Mindy
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