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Revin' up

2006 Hyundai Elantra. RPM’s go flying everytime it’s fired up. RPM’s will drop once it’s put into gear, reverse or drive and runs just fine afterwards. If it’s not affecting how it drives should we just let it be? Is there anything to be cencerned about?

“Go flying” how high? And is it high and steady or high and fluctuating? What if you just sit there at idle? What happens next?

I am not sure how high and it will fluctuate a bit at first eventualy stabilizing, high, but stable nontheless. It won’t drop until it is put into a gear.