i probably did part of the chain then dropped it in my rush to 90 now cant find where i left off lol even dl quest hub add on to help, and went o all locations and nothing.
There's a 'cave' a little south of the M of Mogu' Shan vaults. On the map. When you enter it, youll get a quest and an object that let's you summon the image of loremaster cho. Finish the quest then summon Loremaster to turn it in and you'll be on your way again.
I tried both
:"a 'cave' a little south of the M of Mogu' Shan vaults. On the map." <--[Should actually read Terrace]
:"that quest where you ride the wagon throwing stuff"
and neither were available to me. What I did was talk to Mishi in the Valley of Emperors. It's a little farther south under the M in Mogu'shan. If you've abandoned the quest previously, then you inadvertently destroyed the amulet that lets you talk to Lorewalker Cho. Mishi will give you another, allowing you to continue the chain.