I have a question about a 2005 Mazda 6 (3.0L 6 cylinder). The vehicle was running well and then began running really rough, particularly in the 25 - 45 mph range. Engine just seemed to really resist and struggle. A mechanic evaluated the vehicle and said that 3 of the ignition coils are bad. Does anyone have any thoughts on why 3 of the ignition coils would fail right around the same time? Could the car have been running normally with 1 or 2 non-functional and then 3 was just too many to lose? Or should I look for another problem?

Any thoughts are appreciated

 

What's the mileage on the car? Coils will wear out over time just like plugs so it may simply be time to replace them rather than indicative of something more major.