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[–] diodine 0 points 3 points (+3|-0) ago 

A lot of cars do that intentionally. It could be in theory the idle air solenoid (a bypass for the throttle that allows the computer to let more air in) but I wouldn't worry about it unless the computer detects this (it will) and alerts you.

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[–] cosmic_climb 0 points 0 points (+0|-0) ago 

Hm I see. It vibrates as if I have the foot on both pedals. It seems like reverse idles higher than it usually does but it's been so long since I drove it (wife changed jobs) that I might be remembering wrong. Thanks to @WiLiV as well.