my EML light came on today on my s type v6 3.0 auto petrol with that I had reduced performance I left car for while when next used it hour later it was showing no faults and performance was normal then 5 mins later it happened again! Called the AA his reader showed it was misfiring on cylinders 1, 4, 5 ! Idle was rough too! Left it while again then no faults drove around the block no problems. Then again it happened again! AA seemed to think it might be the coils I some what agree but 3 coils to play up seemed bit weird to me. Any help please.