My symptoms were.....The car was 'stumbling' or 'bogging' down real bad when I would step on the accelerator. Almost as if it were not getting enough fuel. Auto Zone is offering a free diagnosis if your check engine light is on. I would imagine even if it was not on and you are detecting a problem they would still trouble shoot it. Again it showed a misfire. (or a P0304, 0303 would be cylinder #3, 2-#2 etc.) I had started with the easy stuff first like replacing the plugs and wires first. The coil only cost me 70.00 at Pep Boys. Ford wanted 125. and did not have it in stock. Anyway, hope that helps.
