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pulled a computer out of a cougar wit a 2.5?

You have to match the engine (Zetec or Duratec), PATS configuration (internal or external), fuel system (return or returnless), and the transaxle (automatic or manual).
 
Also, some cougars only had three O2s vs. the four in the Contour, or something silly like that...

What's the Catch code on the ECU you pulled, and what is the catch code on your stock box?
 
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