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That issue can be caused by several things on that engine:
-Idle control valve stuck/dirty/failed
-Idle control valve hoses being cracked
-Other hoses being cracked
-Cold start valve
-Failed OVP relay
-Deteriorated wiring harness to sensors/valve
-Multiple start attempts needed can also be a bad fuel accumulator by the pumps
-EHA valve could be bad
-Temp sensors could be getting bad contact or be bad
-O2 sensor could be bad
-Mixture adjustment could be out of spec due to wear/tear/age
-Idle return micro switch could be bad
-Spark plugs worn or dirty/fouled
-Wires going bad/old
-Distributor cap/rotor worn (they do not last as long on this engine as on other engines)
-Leaking fuel injectors causing it to be flooded from the last time it was turned off
I've gone through/replaced just about all of these things to get my 300E in solid shape. Once I did it hasn't had a single issue in years...fires up every morning no problem.
The M103 is awesome when running great but an obnoxious nightmare when not running right.
__________________
-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)
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