If you're referring to the ACCEL coils then yes, there were a couple incidents where the coil had a fault. I can't remember the specifics but most of us with an ACCEL coil checked ours and they seem to be fine. I'm pretty sure those were isolated incidents. A new coil from Ford is probably going to cost what the ACCEL coil does so you may as well go ahead and get it.
IIRC both people that had problems with the ACCEL sent theirs back in and got a brand new one sent out no charge.
