UPDATE!
I changed out the fuel filter last night, and the problem seems to have significantly lessened. I can't say it's entirely gone, but it is a LOT less noticeable than it was. I only got to drive the car for about a minute after changing it, so it may not have had enough time to totally work itself out yet.
I could still feel a slight stumble when starting from a stop, and when going up an incline, but the car didn't feel as though it was going to DIE, like it did before.
If anyone else has any more comments/ideas, they are most certainly still welcome. Thanks for all the help thus far.
