Idle ML

[Myth]

Hi all
I have an ML 270 CDI 2003, i bought it in Feb 2012 and its been running like a dream, a couple of days ago when i started it the idle speed was about 100 rpm slower than normal and it felt a bit rough, it still runs smooth at speed and there is no loss of power, the only thing i have checked and topped up since then is the engine oil and that has made no difference, please can anybody help.
thanks in advance
David.

 

[Myth]

Panic over, must have had some muck in the thingies, back to normal now, oh the rear seat is stuck in the down position, whats the best way to get at the bit underneath?