Ok, guys and girls. This topic has probably been beaten to death here. But I really need some help. My girlfriend has a 2001 Focus SE with the single cam 2.0. It is doing this sputtering deal and at times even stalling completely. This seems to be mostly at lower speeds, but it will do it at higher ones as well from time to time. I know all about the fuel pump problems . . . took it to a Ford dealer and they said it wasn't covered by the recall. This just doesn't feel like a fuel pump problem. I have replaced the mass airflow sensor. That helped for a little while. I replaced the coil pack . . . that helped the most. The problem almost entirely went away. It never stalled and barely ever ran as badly as before replacing it. But then suddenly the problems were back. It took about a month after replacing the coil pack for it to run roughly again. I highly doubt replacing the coil pack would have anything to do with the fuel delivery system if it were actually that, but I could be wrong. There hasn't beena check engine light at all. My gut feeling is some type of vaccuum or sensor issue. Lurking on this board has generated some good ideas for me, but I can't nail it down yet without finally posting. This one really has me confused so far.