1995 Pontiac Transport Died while driving

1995 Pontiac Transport mileage: 86,000. Goes back several months along the lines of the following: 3/24 Died while driving (started after several attempts); 3/25 Would not start. (Same); 3/27 Would not start (same); 3/29 Died while driving. (Same); 3/31 Would not start. (Same); 4/1 Died while at stop light (same); 4/2 Died while driving (same). Sometimes it will start after trying a few times; sometimes you wait a few hours. Mechanic said there was nothing wrong with fuel pump. Could he be wrong? What do you suggest?