You've got the most out of your coils and change them all!---along with all new spark plugs!
It is a bit of labor and do all of what i say to save on overall time and preventative maintenance.
Check for oil in spark plug/coil area as this is not good for the coil.
While you are there change your PCV valve, clean the egr, throttle body and MAF.
READ: Spark Plug Removal Proper Procedure