Tach and engine jumping at 2k and 40 mph

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Joined
Aug 7, 2012
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Location
MD
Anyone else experience this or have any idea what is causing it? I've caught the truck doing this a couple times now. When I accelerate up to around 40-45 mph and then lift off throttle a bit, the engine and tach do this weird jump up and down of about a couple hundred rpm.
 

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