TRUCK DIES WHEN SLOWING DOWN IN HIGH HP SETTINGS

[WOT]

I HAVE SEARCHED THREADS ON HERE AND CHANGED A COUPLE THINGS TO SEE IF IT WOULD HELP. I HAVE A DP TUNER AND IN THE 80 HP ECONOMY AND HIGHER HP SETTINGS THE TRUCK WILL DIE AS I SLOW DOWN THE RPMS WILL DROP TO ABOUT 300 THEN KILL. THE TRUCK FIRES RIGHT BACK UP AND DRIVES. THE TRUCK HAS NEVER DIED ON ME IN THE STOCK MODE SO I WAS HOPING SOMEONE MIGHT KNOW MORE SPECIFICALLY WHAT IT COULD BE. I HAVE CHANGED THE CPS, FUEL FILTER AND OIL BUT STILL DIES USUALLY WHEN THE TRUCK IS WARMED UP OR HOT. ANY HELP WOULD BE GREATLY APPRECIATED. THANKS IN ADVANCE