hey guys, ive been trying to fix a misfire issue with my car. the coils are a yr old and i just replaced the spark plugs. when i drive it still feels like its misfiring and wont go past 3000rpms. it acts like it has a rev limiter on it... i had the codes ran it still lists the misfired but also added the ignition coil b and f are failing??? is it just telling me with coil is broken or is it more complex??? any help would be great... need to get the car up and running asap!!