Well, I've been gone on a detail for a few weeks and I came home to start my car this evening. I've noticed lately, if it sits for a week or two, it's always hard to start. It's seem's to resemble like there's no gas in the line.

My guess is leaky injectors.

I've replaced the FPR, filter, plugs and wires are due for a change, but i wouldn't figure them to cause this much of a headache being AC Delco. Last month, I had an issue with the ICM going bad, but I replaced it. My last set went this long without an issue.

My car is a 1994 SLS

What is your fuel pressure while cranking?

How much would a gauge cost to check it? Could i rent one? I know how the procedure works, but that's not a tool that I have laying around.

Not sure if you can rent one. Might try Autozone. You should be able to pick one up for $30 - $40.

Try Harbor Freight.

Also, as a test, try turning the key to on and leaving it there for a few secs before starting to let the fuel pump recharge the fuel system and see if that helps