91 5.7 tbi starts then dies

Will start, run for 10 - 20 sec. then die. I can eventually get it to run after about 5 - 8 attempts. If i drive it i have had it die on me several times in the middle of the road or at a stop light so now it's garaged. I've replace the fuel filter. Fuel pump is a few years old, maybe 30 K on it. Have tested ignition module Ok. Inspected cap, rotor,wires, connections etc... No OBD codes. Now I'm lost?

Ok, it won't run, does it have spark, are the injectors spraying, will it run spraying starting fluid into the TB, all basic diagnsoitics.

Ok, thank you for the basics.
I finally had time to try this and yes, when it starts to die out I can keep it running with starter fluid. Once i keep it running for a few seconds it seems to take over and start to run properly. I'm not thinking its a fuel pump because once it runs, it runs fine. I'm thinking it has to do with whatever valves or devices regulate the fuel delivery. When it is finally running, i can watch the spray out of the nozzels and it apears to be a nice consistant spray.
What do I check next?

Thank for your help.

Al

You should check the fuel pressure, 10-13 psi is required.

Ok, it seems my fuel pump is bad. It works intermittent. Can i install an in line electric fuel pump to avoid dropping the tank everytime this goes out?

Not really the system is not designed for this, anything can be engineered but a good quality pump should cure this, make sure you do not continually run low on fuel also.