BMW Repair: BMW 1998 540 I, ignition coils, bmw

Question
I NEED TO REPLACE 3 IGNITION COILS IN MY CAR HOW CAN YOU TELL WHICH ONES NEED TO BE REPLACED.

Answer
You have already answered your own question,well at least your problem.If you have gotten this far you know that you have an ignition problem.How did you determine it is coils?Having the knowledge of it being a coil issue, should tell you which ones you think are bad.By removing the cover from the side of which ever cylinder you think is bad.