Replace Fuel Pump. Most Likely Problem.
Reason: If fuel pump doesn't build up at Least 30 PSI, The Fuel Will Not Circulate Back To Tank, whereby cooling it. Test by using a pressure gauge hooked to fuel rail. Disconnect fuel pressure regulator vacuum LIne. The pressure should exceed 30 PSI (simulating throttle depressed for extra pressure) Should be about 30 PSI idling with vacuum line attached & 39 PSI if unhooked. The fuel not circulating will boil inside the injector manifold, and cause vapor-locking. Temporary fix included using a piece of insulated sun shield wrapped around the fuel rail underneath the intake manifold, leaving off the A.C. & hood up on safety latch. Relieve the pressure in manifold using a pointed object (key?). Be careful, you will lose some fuel, but by circulating a little fuel, you might be able to get going, and if on the highway, the added air flow and insulation might keep you going. Hope this helps.
Source: Personal Experience and thought.