Right now my car has a bad stutter in the lower rpms and I thought maybe i just needed new plugs and such but that didn't seem to help. today in auto class i worked on the timing but still no fix....could it maybe be the injectors or fuel filter? I asked my teacher but he seems to know more about Ford's then anything since he was a tech at Ford. I happen to get the Platinum plugs instead of the Iridium...has anyone bought these and actually feel a diff? I was a little low on cash yesterday and just wanted to get some so the platinums were chosen. Any help would be great....thanks