If the engine is running now, we can forget the fuel pump unless other problems develop later. For a single cylinder misfire, park plugs and wires are good suspects, and Fords have a lot of trouble with ignition coils on those engines that use individual ones for each cylinder. An easy way to identify a bad coil is to swap two of them, then see if the misfire code switches to a different cylinder.
Ford doesn't have much trouble with injectors, and those cleaners rarely solve an existing problem. They're better for general maintenance. If you DO suspect an injector problem, you can do the same thing as with the ignition coils. Switch them between two cylinders, erase the misfire code, then drive it and see if a code sets for the same cylinder or the other one.
Thursday, April 3rd, 2014 AT 10:01 AM