Yes it is relatively ez to replace and readily available… but if it was already done what is the logic here? There are many other things it could be such as a bad crank sensor not telling a perfectly good coil pack WHEN to fire the plugs…etc. Dont just swap another coil pack in…they are quite reliable actually and to see two pack failures back to back suggests something other than the pack…now you could get one from a yard just to see… Did the mechanics coil pack solve your issue for some time or something? Any engine codes to go on here?