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Rough Idle In 4 High

FV-Van

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sportsguy

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My guess is this is normal. You’ve engaged the front driveshaft and axle, so more items to actually transmit drivetrain vibes.

My 1996 Cherokee used to do this slight vibe increase as well. There was never a problem - just a change of state.
 

Uhdinator

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Never really noticed with my 2.0L Auto, but i'm usually not idling in 4H unless at a stop light and usually shift on the fly when driving in snow.
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