sounds like your flap is stuck open (presuming your car is not 2nd hand and previous owner fitted the delete plug). Just undo the 3 8mm nuts and pop the lid off, free off the flap, lube, and refit. Simples. Ensure the springy wirey bit inside fits inside the slot. Its not hard. Have a go.
No nothing.
No Mods. No rockers. Just a chunky knob, thats now been replaced by an RS knob innit.
No tackiness.
Std as Ford intended, but with a space saver wheel and jack and nuts and wheel brace. oh.. and flaps, a man has got to have flaps.
Innit?