Vehicle idles high when coming to a stop? on 2010 Honda Civic

esp when going into revs.

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2 answers
air/fuel mixture. have fuel pump tested. diagnostic will reveal prob. still under warranty? it may cover the work.
Auto or manual trans? Describe 'high'----What RPMs? For more than 2 seconds? What RPM is Idle in neutral? Floormats in the way?