Nissan terano misfire

Hello, I have a 1998 terano se 11 2.4 petrol. Vehicle has a misfire at idle which has been getting worse.I have done a cylinder leak test, compression test, basic ignition tests which all seem ok. Vehicle drives perfect and no management lights on. It seems to be over fueling[by smell]and thought might be aleaking injector.I have checked injectors and no obvious injector fault ie dribbling. Just wondered if any known problems or pointers