1996 Dodge Caravan 3.3

Hello friends !, I´d like some help. I have a 1996 Dodge Caravan with 3.3 engine, I´ve just fully repaired the transmission and everything seems to be O.k., but there is only one problem. When am driving sometimes the engine suddenly gets death, most of the times while waitting the green light and sometimes just before start driving, the fact is all I have to do is Neutral-Ignition and go !, so I don´t really know what´s happening, maybe something electrical because when I was scanning the computer the engine suddenly got death and all the readings at the computer got lost. So, is there someone who can help me, please !, I´ll apreciate it.