help me find an electrical gremlin, please

sounds to me like the ECU took a crap or lost its ground....ask me how i know

re-ground the ECU ...take it off and scrape the mounting points. if you have an extra , slap it on there
my Duster used to just die while sitting at red lights(early- 90s). It would lock up and stall as if you had just let the clutch out while holding the brake down.
But it's an auto...
It would run fine other than the occasional stall.
After messing with it for quite a while, finally tried a new ECU and it solved the problem.