I'll second the concept of a AMM, but a real tech with suitable tooling will be able to evaluate it very simply which I imagine the indy did. I also agree with Beckman it is almost never the controller. You are more likely to have 5 bad AMMs in a row than one bad ME controller in the cars lifetime.

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