Shutting off on its own

[83 tt ranger]

so im having the hardest time figuring this out. I put. 98 5.0 mountaineer engine in my ranger kept it fuel injected. Its twin turbo
With a custom tune from a reputable tuner. Every sensor on the engine is new.ecept for crankshaft position sensor.it doesnt do it when accelerating. Only when you let off throttle fast or come to a stop fuel pressure is good i have a aeromotive a1000 pump with regulator
It fires right back up no problems
I hooked up to laptop and run a datalog and the only thing I noticed is the spark or timing is at 25*when its idling then right when its about to quit you can watch the timing go from 25* and fall rapidly to 12* and it quits
Thanks in advance

 

[decipha]

sounds like it needs more dashpot

tell your tuner to set tr_delta to 0 and kick up dastctl, dasmin and minmph

then reduce dashpot decay down low