Vehicle will not start

1993 Suburban 350 V-8. This event ocurrs randomly. If several stops are made during the day, eventually the vehicle will not restart. The vehicle will start if left to sit for several hours. One time the vehicle stalled and would not restart. I tried spraying starting fluid into the throttle body with no success. After that incident, we towed it to our mechanic. He could not work on it until the next day. He could not duplicate the event. The engine cranks. The fuel filter was changed in February 2010.

If spraying starting fluid didn’t get the engine to start, then there’s an ignition failure problem. And the first suspect would be the ignition module located inside the distributor.