Hey Folks,
I've ordered a ALDL cable from http://aldlcable.com/aldl.aspm and am going to download TunerPro RT this evening.
When I get the cable it will be the first time I have ever plugged into an ECM other than a code reader.
The vehicle is a 91 C1500,305,700R4,2WD,3.08 gear and 90" of tire. ECM is a 1227747.

I've named it ol Smoky.(because it did) I'm not going for a race truck but I would like to get the most power and efficiency that I can. The motor is not long for this world so if/when it grenades I'll just sweep up the pieces and drop in my 355.

I'm totally techno illiterate but I do have a firm grasp of naturally aspirated engine theory and have built many engines and ported many heads for many moons so things like air/fuel ratios and timing curves and such are not new to me.

Reading them and changing them on a laptop will be.
What do I need to know to get started?