I honestly don't know what could be causing it, so I'm gonna replace all the plugs anyways, they're oldish. And especially since it happened right after I got snow in there, everything points to that. It was really bad when it first happened, but now it's gotten better, but has stopped getting better and kind of plateau'd.
2003 Focus LX Red (RIP)
2002 Focus SE Red (SOLD)
1995 Jetta GLX: VR6, Intake, Exhaust, Lowered, 5-speed, you get the idea.