My 2012 Civic Si did the exact same thing. It's just the A/C compressor kicking on, which puts load on the engine and the ECU has to compensate by adding more fuel to keep the idle speed the same and not stall out. My gear shifter wobbles when it does this too, but that is probably just rough running in a low RPM range the engine wasn't designed to be run at for a brief period of time.
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