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@adroit
Is it a sticky link in the chain? turn the cranks and watch the chain and see if it is anything other than smooth. Also have a real close look at each link from above and make sure the sideplates are all ok, a bent one, or one coming away will be fairly obvious.
Check the powerlink too, of it hasn't locked into place properly it might be the problem but if have have applied real pressure it should be OK.
If it isn't the chain then it must either be the chainring (look for a bent tooth) or the hub, is this a sprocket on a freehub? Is it tight? are there enough spacers to hold it on tightly? Of course I assume the chain is tight enough with the tensioner.