There is NO SUCH THING in an internal combustion engine as too much air. There is however a situation where you don't have enough fuel for a proper mixture for the air present.. If there were a such thing as too much air turbos and the like wouldn't exist..
Check the carb air balance pipes from the top front of the carbs to the 2 spouts at the front in the ram air scoops. Chances are one has come adrift some where or the little filters are blocked with bugs.