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Q: I have a 2007 Hyundai Sonata. Whatwould cause the gauges to rapidly fluctuate. on 2007 Hyundai Sonata

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Both my spedometer and rpms will flucuate up and down with out any change to my speed or rpms. my spedometer will fluctuate 10 to 20 mph at a time. It seems to do it the most when engine has not reached opperatting temperature yet. Any ideas?
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