Hi guys I have a engine tick I’m assuming is coming from cylinder number 2 because when I unplug coil pack it stops, I have tried everything I could think to find it,it all started after I did a tune up for a misfire on number 6, initially I changed plugs and wire misfire went away but now I have a aggravating ticking noise I replaced the coil pack on #2 did nothing,engine flush did nothing,removed valve cover rocker arms and push rods look fine cleaned them and reinstalled them still didn’t work,is it possible that number 2 fuel injector could be causing this I have no check engine light on now so I’m stumped on this can’t understand why it happened after a tune up,any help would be great thanks.