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As for the code, I understand a simple wire jumper between pin 1&2 will make the check engine light blink the codes...
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Here are some web sites with the basics on retrieving codes without a scan tool or code reader.
Poor drawing of ALDL but ok instruction + codes
http://www.cfm-tech.com/gm_tbi_trouble_codes.htm
OBDI terminal identification
http://robertpowersmotorsports.frees.../ALDL_plug.jpg
OBDI illustration and instructions
http://www.troublecodes.net/GM/
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Another idea might be the oil pressure switch/sensor?
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As I stated earlier, there is a redundant circuit supplying power to the fuel pump, meaning two circuits supply power to the pump. One circuit through the oil sender/switch, and the other circuit through the fuel pump relay. If either circuit is ok the truck will have power on the fuel pump circuit, once the truck is running and has oil pressure.
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As for the failing ignition module, would that control the power going to the injectors and stop gas from coming out at all, even when the pedal is depressed? or since it is an electrical system and not manual pump, pumping the gas pedal without power wouldn't do anything...??? Basically when it won't start, there is absolutely NO gas coming from the injectors but there is a light gas smell (and it wasn't the burritos.... this time).
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The computer needs to receive a distributor reference pulse from the distributor module to trigger the injectors.
It is possible for the module to produce spark without the computer getting a reference pulse. A bad distributor module or wiring between the module and the ECM can cause this.
With the key on there should always be power at the injectors. The ECM does not supply power to the injectors, it supplies the ground. The ECM grounds the other side of the injector, to make the injectors open.
A "Noid Light" can be used to see if the injectors are getting power and being triggered by the ECM.
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If the only problem is dying at idle or starting problems, it is also possible that the distributor upper bushing is getting so loose that the reluctor points on the distributor shaft are coming in contact with the points on the pole piece of the pickup coil. See if the distributor shaft can more sideways.
Oil coming up the distributor and leaking on the distributor pickup coil can also cause distributor reference pulse issues.