slow to idle hanging revs

[custardsastra]

hi all question for you all has anyone had an issue with the revs hanging around 1200 -1500 rpm then slowly dropping to idle on 2.0 cdti sri

everything  else seems ok i only have a code reader which i shall be putting on tomorrow to see if anything pops up but at a wild guess im thinking throttle body gunked up causing it to stiffen up

i only had the car 3 months it has 60k on the clock says full service history but as i havent done this myself its just a piece of paper and i doubt very much the egr system has ever been cleaned

thanks for any help