If your Ford Escape, Focus, Mercury Mariner or Mazda 3 vehicle has begun to misfire, idle erratically, or hesitate under acceleration a bad coil pack could be to blame. By providing the proper spark to the spark plug all of these running issues can be resolved. This AA Ignition Coil Pack Set of 4 is a direct replacement for the factory Ford, Mazda, Mercury or Motorcraft coil. Made by an original equipment supplier (OEM) these coil packs surpass the factory quality and will get your engine running how it should be; smooth and fast.