Runs for 20 seconds then stalls

My van has trouble starting. It will conk out once or twice before it comes on(mostly at night) & when I drive the van jerks a bit until I get up to speed. I have tried replacing the spark plugs(gapped properly), spark plug cables, distributor cap & rotor and it still has the same problems. Do you guys have any idea what it could be?

Thanks!

Engine stalls after about 15 seconds. Will restart but dies again. Can hear fuel pump run and stop after short time and relay clicks. Will not start after it stalls unless key is turned off and back on.

Electrical problem
1990 Chevy Van V8 Two Wheel Drive

I have changed the fuel pump, and fuel relay switch and I can not get my van to run more than 20 second, it dies. If you pour gas into the throttle body it will stay running. What makes it stop running?

Also, in order for my van to re-prime itself, I have to turn the key off and then on again. It will not re-prime its self if I just leave the key on and start cranking again.

Do you think I should rebuild the throttle body?

Engine shuts off when I turn the headlights on or blow the horn and wont for days have tried new fuel pump and checked all fuses realys are ok had them checked need to have fixed soon only veh I have need help please

The fuel pressure is good. I cleaned the idle air control valve and it will start but it dies in 20 seconds. Also, in order for my van to re-prime itself, I have to turn the key off and then on again. It will not re-prime its self if I just leave the key on and start cranking again. Something is making the fuel pump stop pumping. And I have changed the fuel pump 2 times now.

I just bought a 1989 chevy g30 van the guy told me it stalls sometimes and it might be the ignition coil. So far it stalled 3 times a day sometimes more I had it for about 5 days. When it stalls the check ingine light comes on and the car dies but before it does it strugels a little bit also a burst of I guess gas comes from under the air filter and then dies the fuel pumps new the alternators new its fuel injected

Engine runs for one minute, then stops

Thanks for responding. We installed a new mechanical fuel pump three weeks ago, and had it running fine. Now, It starts every time, runs for a minute, then stops as if something is telling the carbureator to stop requesting fuel. We just re-connected the radio. But had to cut some speghetti wires to do it.

Thanks again. Lost daylight last night, and will investigate tomorrow morning. Honestly, have no idea where the needle valve or the idle circuit is, but will research it now.