Fluctuating RPM 2007 G35

Geezer211

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After changing the ignition coils and spark plugs the engine sounds and runs great, however, the rpm fluctuates slightly at idle and seems to correspond to flashing battery and brake warning lights. I checked all of the hose connections for leaks and security and also thoroughly cleaned the battery posts and cables of corrosion but it hasn't changed. The flashing warning lights stop at higher rpms (>2300).
 
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