Q: what would make my car misfire intermitenly while driving and also when ideling on 2005 Chrysler 300

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
has had new spark plugs and wires and a egr valve replaced
(2) Answers
Was the misfire diagnosed before the parts changed ? If so , what cyl(s) had misfire codes? Why was the EGR valve replaced?
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