Misfire on my 3.4 on 2005 Chevrolet Impala

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?

Asked by for the 2005 Chevrolet Impala
Yes ,you need to do more testing ,try putting old one back in....
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.
Hahahahahaha,welcome to my world ,crazy rite ,now its fine?.