Van shuts down 5 minutes after start up

When I start the van it will shut down after 5-7 minutes--once it's warmed up.  Then it won't restart but cranks over great!  Changed the coils, catalytic converter, distributor and other items.  I can hear the fuel pump turn on upon starting.  How about the ignition coil wires, plugs/wires, crank sensor, EGR Valve--anything else?  I'm putting more money into it than what it's worth! Nobody knows what it is--it's all a guessing game!  Thank you for any input in advance.