I would check for a plug wire problem.

The fuel injector will be turned off if a misfire is detected. This is often the reason for one injector to be shut down.

I wouldn't be surprised that the controller can't be moved once its learned the car. All units after 98 would be I'm not sure on how DAS interacts on a 97.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician