Chugging,like missing,rough tick over,clears on high revs 2003 c180k se coupe

[harries2]

i have a coupe 2003 c180k se which is very strange it runs ok on high rev but on low rev its like kangeroo petrol and the engine does not sound right it is like it is hunting,chugging etc i can not see any obvious air leak etc some help would be very gratfull all comments please so i can try. Thanks carl .
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[nick mercedes]

Timing chain he has slipped?

 

[harries2]

Hi ty how would i check to correct it and is there a special way plz.?

 

[martyz]

What is the mileage?