91 Lx 5.0 five speed hatch. He just put it together as he bought it as a roller. Car runs fine down the road. Come to a stop for over 2 minutes and it dies. Starts right back up. So I get it back to the shop and throw on a fuel pressure tester. 75 pounds of pressure. I know it should be 40. When it starts to die the fuel presuure drops to zero.So I change the fuel pump and filter. Same thing. Change the fuel pressure regulator same thing. Figure maybe I just had bad luck bought a new pump. Same thing. To date I have changed the ecm. map sensor fuel pump relay. I even tried unpluging the 02 sensors to put it into closed loop. Same thing