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Is this a possibility? If you could figure out what sensors under what conditions trigger the Deceleration Fuel Cut Off (DFCO) it might be worthwhile to figure out how to trick the computer to do all the work. Each car may be a bit different; but if the appropriate sensor feed voltages could be adjusted by the push of one button; it should activate the DFCO and not set off any fault codes. This should ensure that all emmisions systems would activate properly, i.e. no fuel dumping outside of engine spec.
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