The car runs smoothly again, after fixing two issues.
It was running lean due to spark plugs rattling themselves lose again. I know for a fact that I have torqued them every time they have been removed, but I have thought every time that spec (12lb/ft for previously torqued plugs 22lb//ft for new ones) was weak. My torque wrench only goes down to 15 anyway so I always went with that. They're tapered plugs so I'll just run them in tighter from now on.
Retoquing the plugs obviously made it run better, but still not very well. I also had another bad coil causing dead misfires on 2 and 5, so just replaced all of them with new Delco professional units. Hopefully, these will last longer, but I'm going to keep a spare coil with me in the car from now on just in case.
Now that that is all figured out, I am trying to make my newly hacked up bumper look a little more presentable while also protecting my intercooler from road debris. I'll post some pictures later tonight!