I finally swapped my 450000 km old M102 carburator engine with a 150000km old M103 engine. However, engine always requires a second crank to start, when both hot and cold. Touching the gas a little bit helps, but I'm not really used to start the engine this way. All maintenance and tune up was done by MB dealer couple days ago, everything looks perfect on screen. Does anyone know what's going on?

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2001 E200 Kompressor Avantgarde
1987 300E 5-speed
1976 450SLC
1975 280S (sold)
1973 230.6 (sold)