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What does it cost to replace a defective PCM?

(2004 Ford Thunderbird)
in Noxon, MT on April 09, 2013
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?
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