2005 S4 Tank Breather Hole On Right Or Left?

Low end in 1st/2nd (1-3K) doesn't have torque expected .. discovered hose from airbox to ecu disconnected so put that back in place (rubber couplings on both sides crumbly!) but symptoms continue (not sticking at 4-5k on way down anymore .. still kind of snatchy 1-3k). Tank has slight vacuum after running for a bit so suspect not taking in air as it should .. two nibs towards rear of tank (1 overflow, other breather?). Which is which. If one on right (looking forward) as I suspect can I just stick a wire up to clear? Doesn't tank cap have ventilation mechanism as well? Thanks,