The injector clean would have saved the cost of a new set. Idle is poor most likely due to bad spray from injectors or low fuel pump pressure. Check them both and correct any faults. Then go for a long (local) drive to get things moving again. Gentle on brakes etc and keep speeds down. I suggest local only as you have to restore reliability - long walks should be reserved for sunset beaches!
Good - Fast - Cheap: Pick any two.
E23 735i; E30 318i; E32 735iL (X 2 - 1 Alpine White and 1 Glacier Blue); E34 535i; E38 735iL; R50 Cooper; R55 Cooper Clubman.
E21 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i