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Q: Misfire on my 3.4 on 2005 Chevrolet Impala

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Had a slight misfire. Diagnosed to number 5. Put on a new coil pack and now it runs worse. New plugs and wires. Whats the deal? Could it be a bad new part?
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I started it today and it ran fine. Idk what is going on with it. Been doing this stuff 22 years and never seen anything like this.
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