Yep, I'm with cooperman. Coil packs age and this might be a sign that yours is getting tired. If it starts to recreate the same symptoms again suspect its on its way out' you might also have loss of power from an inadequate burn if the spark is too small. Incidentally ford revised their iridium plug gaps to 1.2mm which resolved the problem they had with coil packs failing, their original setting was 2.5mm which caused plug failure and then coil pack failure as the gap became so large that the coil was under immense strain, coupled with heat they failed on a regular basis! Hope that helps.
