DLIDFIS issue

[Rogue_Wulff]

My GSL-SE has been converted to carb (edelbrock 600 and RB intake) along with the DLIDFIS system. The DLIDFIS was wired using 3 GM modules and 3 MSD Blaster coils.
When I got the car, it had major ignition problems, that I finally got corrected.
Then I parked it for the winter. Drove it to where it spent the winter running fine. Parked it, disconnected the battery, and left it untouched for 2.5 months.
I went over a couple days ago to get it fired up, and discovered no leading spark. It seems that both leading modules tested bad. I fired it up by putting the trailing wires on the leading plugs, and a couple spare plugs in the ends of the leading wires. Evem after running for a bit, still no sign of spark. That was when I pulled the modules to have them checked.
Anyone ever encounter something like this? It just baffles me as to how 2 modules can go bad, at the same time, without even having been powered up for over 2 months.