The "open-ended wrench" check engine lite comes on intermittently (I don't have the codes). An igniter coil (cyl#5) has already been replaced, as has the throttle control housing. Absent an undiagnosed wiring problem, the PCM is next on the list of "best-guess" causes for this problem ("limp-home" condition). How spendy is THIS PCM/computer replacement?
What does it cost to replace a defective PCM? on 2004 Ford Thunderbird