engine cutting out

is it starting or just cranks and doesnt start? or does it start and run then stalls or dies?who told you to do the coils?just unlikely that all 6 would be bad and wasnt neccesary.ive had people tell me they replaced 6 coils 6 injectors,6 plugs,and i find that they were using 87 octane for too long.let me know if your still having this issue.

Try replacing the Mass Airflow Sensor (MAF).

I suggest getting the fault codes first before guessing. You'll just end up buying parts you don't need (like the coil packs).

Check for spark, fuel delivery, and crank position sensor (CPS)

Hi i have a 630i bmw when am driving it sometimes losses power an after couple reves it comes back to its self i changed the exust cramshaf sensor spark pugs an all the service part cleared all the faults after i did that no faults come up so it was clear now seems to be doing it again