new member/P1414-p1417-p1668

Help, My 2003 discovery fault codesp1414-p1417-p1668. Something about secondary air system? Do you know? Occasional stumbling and choking.Clears up and drives smooth and perfect.58,000 miles and this is the first problem!! Help.....

probably the charcoal canister/filter. hope it helps, duboff.