1990 astro wont run

hi all, my name is pete, I live in s. florida. I have a 1990 astro van vin Z 4.3L, TBI. my problem is it cranks, may even start for a second, then die. fuel pump runs, has spark on ignition wires, don't know about plugs. changed, distibutor, rotor, oil pressure switch. injectors spray fuel for 2 sec. then shut off. any help would be deeply appreciated.

Have you checked pressure at the injectors/pump?

hi, and thanks for posting. the problem turned out to be a bad fuel pump. the confusing part was the motor of the pump was heard to be running. anyway, the pump was bad, no pressure.