Rev 318 in park, slows down and stalls..case study.

Does this have EGR? EGR is only active (open) during part throttle. closed during idle and WOT. are you bogging at the EGR tip in? You may have a pooched EGR diaphragm. Just pinch off the EGR vacuum line and test.

<<< just listened to the video and I bet (rebuilt carb?) your needle seat is flooding it. Thats why its a little cranky to hot restart. I had a friend who had a misadjusted regulator (wide open) and a black pump and it just overloaded the carb to the point where it would just gush out the booster and flooed it after about 30 seconds.