What procedure did you use for your valves? Looking at doing mine soon when the new gasket comes from Bavauto.
For ideas on rough idle?
Pull your spark plugs, how do they look?
Pull your wires, they look corroded? I'd say take a resistance reading but we don't have any stock new wires to compare them too.
Might also be your distributor or the rotor in your distributor, pull it off and see if you see any cracks or arcing in the casing.
If in doubt, replace, all those parts are probably alot cheaper then replacing the torque converter.
You can check compression as well, might cause a slight rough idle if your loosing compression in one of the cylinders. Lookup the proper way to do the compression test but in a jiffy, take all the spark plugs out, test each cylinder, record each result, now put a couple of drops of motor oil in the cylinders, test and record again, will help tell if the rings are shot. If they are still showing a difference in compression, take it somehwere for a leak down test, basically pushes air into the cylinders and out of whatever is leaking/broken, example, rings, you will hear in dipstick, valves, you will hear in valve cover/valve area, so on and so forth.