Question about MagnaFlow 2003 Chevy Impala - 3.8L V6, code K engine, with federal emissions system - Catalytic Converters - 49 State Legal

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All gauges fluctuate

I just changed my whole coolent system but the last time i drove it my gauges kept dropping to zero. so i cut the car off and now it dont want to start back up. the radio and everything comes on but when i got to turn the key to start everything goes out

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