Every car will be different. What you want to do with the DFCO settings is datalog your MAP readings during powered cruise and coast. You want to set the enable threshhold under where your powered cruise usually sits so you don't accidentally enable DFCO while under powered cruise.
Next, search for your lowest MAP readings while in coast and set your DFCO return MAP a bit above that. For manual cars you may need to increase the fuel return amount and how quickly it occurs. That is what will keep the engine from stalling.
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-Jason
1969 Pontiac Firebird
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