Ours had the same problem. After replacing:

-temp sensors (both)
-coil
-distributor cap
-rotor
-idle control valve
-adjusting air meter plate (was jamming)
-various rubber tubes
-CPS (Crank Position Sensor)
-OVP relay
-Some fuses

It now runs great!! It was having the same startup/idle issue as you had.

My method of parts throwing paid off.

__________________
-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)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)