Haha best and longest lasting ones. Because its running on 5 cylinders its easier to diagnose.
Start by:
Starting engine, then 1 by 1 disconnect a coilpack and see which one doesnt affect the engine sound.
Whenu find which cylinder is it. Try swapping a coilpack from another cylinder to the dud cylinder. Then if it doesnt fix the issue, try swapping a spark plug from a different cylinder.
Pull all the spark plugs out and keep them in order. Is there one that is different to the rest?