V50 D5 2008 Manual Idle Revs dipping

[Electronix12]

Hi Guys,

Small issue and I'm thinking it is a sticking throttle body.

Every so often when I come out of gear the revs will dip below normal idle (~550, jump back up to ~900 then settle down to whatever normal idle is (700 whilst moving, 650 whilst stationary?)

(Difference is it leaning out, I assume?)

Is it easy enough to take the throttle body apart on these (Had a look at the 2.0D cleaning, but rather have abit more knowledge behind me before I give it a good going at).

It is going into Volvo next week, so I might just make them do it but how do I know they will clean it properly (or if that is the issue at all!)

No error codes, DPF fitted (no fluid version), 115k miles.

[5cilinder]

First if the throttle is faulty you dont get this symptompe
On a gasoline engine yes diesel no
A diesel idle is fuelcontroled not air
second if the throttle is faulty it always raises a faultcode if the position is false
Third the cleaning is very easy to do yourself

[Electronix12]

Any guides/photographs or manuals I should be looking at?

It is happening more and more often now, even twice in a row:

Come to a stop, revs drop to normal idle, then drop to 450ish, I put the clutch in thinking I'm still in gear!! and it then (probably due to coincidence rather than the clutch) goes back up to normal idle. It then did it again exactly the same.

I blipped the throttle and it didn't do it again.

The car isn't warm at this point, I don't recall it happening whilst completely warm...