I'd probably try to get a chip from a 2.8 or 3.1 TBI engine for backup fuel. Limp mode is programmed by resistors on the memcal. It's possible to make your own but there's a fair amount of work...

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Seems like you really lucked out with that deal. The four letter code on the EPROM is the key to identifying the ecm. BDUY was used in ECM number 16196396. It's listed as...