restless running Scorpio 24V

Hello together! For some time now I have a problem with the 24V engine in the Scorpio. The engine runs quite restlessly in idle mode (the engine block shakes), but at increased speeds it gets better but not enough good. In addition, a flap (even in warm condition) can be heard on the right side of the engine. It is not a loud hit, but an unusual and clearly audible noise. The engine has m.E. full power and no oil or water consumption/ With the request for quick tip’s!!!!!