Engine Problem Cutting out (Help)

I have a 2002 Camaro 6 cyl I changed plugs and wires about 6 mos ago then a week ago i started the car and it was missing very bad then the check engine light came (#5 misfire) I change plugs seemed ok from the initial start but when I got on it it cut out. Now, it is cutting out very bad, missing (no check engine light) Could this be bad wires, fuel issue? I have a 122K have not changed fuel filter. If in nuetral and rev'd does not seem as bad vs in gear with a load

Cracked plug, improper gap, or a wire issue.