Heres the deal, 82 240D, idles rough, smokes & nails, seems to be worse when warm. Has plenty of power and runs smooth (no nailing either) when NOT at idle. It always fires right up

What I've done,
changed injectors
changed the IP & retimed
readjusted the valves
I can hear its missing at idle and haven't done a compression test (gauge is loaned out)

I'm thinking it wouldn't be poor compression in one cylinder due to bad rings because it has plenty of power and runs great
above idle without any nailing or smoke. When I readjusted the valves yesterday I tweeked each valve around this way and that, thinking there might be carbon hanging one up. To me the symptoms point to valves?? One other thing, one of the valves on # 4, exhaust, I think, SEEMED to rotate easier than the rest. The spring was intact and I couldn't see any reason why it shouldn't rotate as easy as the rest. Any ideas on what could be going on before I pull the head ?

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"