Hello,

It seems I have some misfires at idle - is there a sure way to determine if it's the coils that are failing?

I have noticed there a wild price range with these coils, from 199 USD for all 12 to 50/60 USD for only one.

Any advice on which ones to use and/or avoid? Beru, Bosch, Maxgear, NGK?

 

For my 2005 Continental GT I went with VW part number 07C905715A and they are working great. I figure these are probably the exact same as in the Bentley, just not marked Bentley and would be the OEM quality. See this link and you can see the superseded numbers etc. My 2005 part number was originally 07C905115F but this shows as the VW part that Superseded it. They were about $30 USD each with list price at $42. I replaced the coil packs at the same time I did all of the spark plugs using NGK-3586 Audi VW Spark Plug - NGK 101905600A. It is my understanding NGK makes the OEM spark plugs as well. YOu will want to confirm the part numbers on your car from the dealer and then cross the parts. On the NGK I went to their website to see what they recommended for my car. Best of luck.
https://www.jimellisvwparts.com/products/5160563/07C905715A.html