Update: I went back out after my last post and did another spray test to check for a vacuum leak, making sure I didn't miss something and still nothing...I was using brake parts cleaner if that makes a difference...I suppose it would do the same thing.
And my suggestion that maybe there isn't anything wrong and it's just me...scratch that. There is definitely something wrong. I just went to the store and back home and there is a miss or something. It wobbles/jitters/shakes at low RPMs and if I accelerate hard it has a shutter-type acceleration...almost like it's struggling to go. It's not awful, but I can feel that it isn't smooth like it was a few days ago. I put some more B12 in it just now thinking maybe removing the fuel rail I might have gotten some debris on the injectors or something. I was thinking it also might could be the ignition coil.
The thing is, it all started after doing a coolant flush. When I did the flush the engine was warm--not too hot to touch though--could something have warped?
All I know is I feel like this guy --->
