I could be mistaken but there's no mod that can tell you exactly what quests you're missing unless you've been running a mod from lvl 1, since blizzard doesn't allow us to peek there.
On a more practical notion - I would bet the quest he's missing is the one from Sunspring Post.
In one of the huts there's a Kurenai npc guarded by 2 brutes. Once you kill the 2 brutes, and ONLY after killing them, he will have a ! over him. Accept Q and escort him out of the village.
|