[rickpilgrim]

My 92 K2500 had an few issues when we bought it like yours. 1st was the every 4-5 day dead battery that was caused by an aftermarket stereo the PO installed that had a constant draw even though wired correctly, Second was the no start without a cup of fuel in the tbi every now and then that turned out to be a fuel pump with a dead spot, but as soon as it started on that cup of gas it (vibration?) worked.
The ignition module is not connected to the fuel pump circuit so don't waste time there unless no spark. This sounds stupid but did you check all fuses?
You should be able to see fuel spraying from the injectors when cranking also. It seems strange to me after sitting 2 yrs to have these problems, it must be something simple.