No start ~ start and stall issue

[PDD33734]

I have a 1995 Chevy 2500 5.7 TBI that is hard to start, and when it does, it stalls immediately. I bought TunerPro because this vehicle is one of those interim year vehicles, meaning that in 1995 it could have been either OBD 1 or OBD 2, and mine turns out to be OBD 1. Sooo, now that I can communicate with it, I have questions but mainly about TunerPro.
I am trying to find information on:
1) term definitions
2) normal indication limits on TunerPro
3) startup indications
and probably others. I am new to TunerPro, but, I don't seem to have the series of problems (comms) that others are experiencing. I just don't know what is normal and what is not. For example, TunerPro is indicating "160 : IAC Present Motor Position" and "33.51 : Injector Base Pulse Width", and I don't know if these are good or bad. I am trying to troubleshoot a "no start ~ start and stall" problem. Here I thought TunerPro was going to help and instead, this is what I feel like. I have tried looking through the index with no luck.

Items changed prior to TunerPro: EGR, IAC, Rotar and cap, Wires and plugs
Items changed after to TunerPro: Ignition module (called out by TunerPro),

Vehicle smells of gas when cranking, so, I don't have a fuel problem. Changing the ignition module changed nothing. I'm tired of changing random parts.
After >$300 in parts and no improvement in performance, I am tired of guessing. I want "know" what is wrong with my truck.

Any help you could provide would be greatly appreciated. Thanks.