Thats the throttle body... on the altezza its half mechanical and half electrical (drive by wire)... the electrical part is the first 50% or so of movement. They do it like that so the ECU can control the idle and back off the throttle for the traction control etc. The mechanical part is so if the motor in the unit dies you can still drive the car.
Firstly take off the intake and clean the blade with some carb cleaner and a rag. You can push it open by hand enough to clean the back sides. They get sticky from oil from the PCV and it affects the idle. Be careful not to lose anything in there that might get sucked into the engine!
Also check the adjustment screws on the side of the unit... they are factory calibrated and marked with yellow paint. Quite often mechanics fiddle with them trying to fix unrelated idling problems and it totally screws up the idle and causes flat spots.
Whist you at it clean the MAF and check the vacuum hoses are all connected and not damaged etc.