[JasonT1124]

I was a service writer at a Ford dealership for years and we saw this problem often- and most times it was ford's great fuel pumps. Some focus cars had a recall on it.... but basically when the pump gets hot it starts bogging down and cutting out, which can cause a misfire feel. Look into your fuel pressure... but if it was spark related, it would definitally throw a missfire code and your check engine light would at least come on when it was acting up.