2002 - C270 CDI

After a warm restart the engine is limited to 3000 RPM in any of the 6 gears. There isn’t any cockpit warning and the engine runs smooth but its rpm is limited. The problem disappears when the engine can cool for a few hours.
Does anyone have a suggestion?

 

possible causes are two iteams on this models are inlet shut off port motor is part of complete inlet monifold,the shut of ports do get cloked up and causes such a fault,or a simple air mass sensor,have the code read for a start and wat comes up good luck.....................