New issue or just normal? Now that the idle is low, it sounds a bit too low. It doesn't sound like an old Stovebolt if you know what I mean. Thoughts?

I think I may need to adjust the idle screw. Additionally, the engine seems to vibrate much more noticeably than before the recent work. Like side to side vibration of the cab/frame that almost seems like out of timing or misfire? It might be just me, but it doesn't seem to idling as smoothly as I think it should.

Ideas???