My 350SDL runs great when ice cold, anytime when driving and when well warmed up. If I start it cold it fires up in 1 crank revolution but if I just let it idle and warm it it will start to blow strokes, intermittent and not alarming, but noticeable. If I drive it, this goes away almost immediately like fuel is building up in a sticky injector or delivery valve.

It also puffs smoke at the 41-75C range at idle like it's not fully combusting the fuel. Again, if it's driven and warmed up while driving, this doesn't occur.

Next, if the car sits long enough to cool down to say 60C and I start it again, it shakes a lot on startup and clears up to smooth running in about 5-10 seconds

None of these symptoms affect driving the car, purely at idle and mid-temp warm starts. Otherwise great power, smooth acceleration that is expected from the 603.

Any thoughts? Are the delivery valves and injectors the place to start and the likely problem?

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1982 300TD 210K miles ("The Replacement" aka "The Anvil") - SOLD
1979 300SD 245K miles (never ending project)
2007 Pinarello F3:13
1995 Ducati 916 (SOLD, sniff)
1999 Ducati 900SSie (SOLD)