[eatsleepboost]

Yea I think change all plugs, coils 1+2 and put some miles on it. Not going to be easy to diagnose as it doesn't do it often and he can drive hundreds of miles ok.

You could also just do the plugs and move coils 1+2 to other cylinders, say 3+4 or anywhere easy to access and remember or mark them. Clear all codes and continue your normal routine with the car. If it happens again check for codes to see if it chased one or both coils. You could buy a coil or 2 and keep it in the trunk for that occasion and swap it out right then. Might want to throw some thin gloves in the truck too since the engine will be hot if you need to change it