An often overlooked cuase for stalling.
Hall effect sensor on the back of the speedo. It can cause intemittant havoc.
It seems that once you take your foot off the throttle and you are slowing down, this sensor's signal tells the software in the EFI module to prepare for idle mode, without it the computer thinks you actually want the fuel supply to stop all together and as such, shuts down because that is what it thinks you want it to do. Something so small can cause so much grief .