I had the same issue, I did new CPS from pep boys and still had the code. Got the CPS from Ford and immediately code was gone. Quite a bit more expensive, but the OEM part worked... If it happened again, I'd probably try Pep Boys again though. $17 vs $48 or whatever.
In the market for a Fox body...
SOLD: 2007 Performance white GT Premium.
Performance: Eibach lowering kit, SVT wheels, Steeda Camber Casters, Steeda short throw, FRPP 4.10's, Airraid CAI, BBK 62mm TB, Brenspeed Detroit Rockers, Pypes Longtubes with O/R H and Violators.
For fun: Window louvers, 15% tint, Raxiom tinted taillights, J&L Audio sub.