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It is possible the ECU is bad, and I've had it suggested before. However, being an electrical engineer, I find it very unlikely that an ECU would just "go bad". They should be one of if not the most dependable electronic component on the car. I would be inclined to suspect many other parts before giving in and replacing the ECU as a last resort. In my case, I don't have any strange codes to suggest it, just strange operating characteristics.
All that said, strange things happen and it very well could be the ECU.
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Mine: 2002 Focus SVT: 137k, Sonic Blue, #1654, Moonroof, Winter Pack, Audiophile
Mods: Tom's Tune, Borla, CFM STS, painted Machs, Euro grille
Hers: 2010 Focus SES: 59k, Ebony, Auto, Moon and Tune
Mods: Stock!
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