My Chevy van dies out at random times during idle or low speeds. What is the problem?

Question

1992 Chevrolet Van. 5.7L V8 (Throttle Body Injection)
New fuel pump, new filter screen, new fuel fliter.
Rebuilt fuel regulator (Replaced diaphram).
New plugs, new wires, new distributor cap and rotor.
New coil wire, using original coil.
Checked EGR valve. Seems OK.
Vaccuum appears fine (Replaced bad looking hoses, but they were not leaking.)
MAPP appears to be working OK.
Bad MAF sensor would make engine light go on, right?
*Is there a relay for the fuel pump?
*Check engine light doesn't come on when engine is running.
So maybe Idle air control valve or throttle position control is bad?
*Injectors seem to stop at same time, so engine stops getting gas.
Other notes:
Engine is hard to start. Dies infrequently. (Dies after a few seconds - 5+ minutes) Pumping the gas rapidly while starting helps get get engine going. Drove it on highway and works great.

Answer 1

You may have a clogged EGR valve. Remove it and check for carbon build up. If there is, clean it with a carb cleaner spray and try to remove any carbon in the egr port. You should have an induction cleaning done on the fuel system when you are done to totally clean the rails, injectors ,plugs and valves. This will improve gas mileage and acceleration too. Also you may not get a check engine lite with a bad mass air flow. With the engine running, tap on the MAF with a screwdriver, if it stalls on you, then you may have found your problem.
good luck

Answer 2

Had a similar problem once and it ended up missing teeth in the fly wheel. I ended up finding after I replaced the Battery, alternator, starter and fuel injection.

Answer 3

Sounds like you need to replace the timing chain

Answer 4

check your inline fuel filter