Stumbling start is most likely: Spark plugs, rotor, cap, wires, fuel pressure accumulator, or leaking injectors or vacuum/hoses under the air cleaner on top of the engine.

At high miles/age, pretty much all of that can use replacing.


As for the air injection pumps....I chopped the belt off of it on both of ours....

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
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'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
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