Sounds exactly like what I experience with a bad head gasket. If this occurs on first startup, what I found was that the coolant would leak into the cylinder when the engine cooled down overnight.
One week ago I changed all spark plug. I did it because I was doing borescopy of the cylinders, it was dry everywhere. Engine runs smooth at start, stable on idle. I drove with computer connected to the ECU. No missfire. I checked exhaust, both pipe without smell of coolant, without humidity and cloud of steam.
Good luck, but I am betting on a cylinder head gasket
I afraid of this, it is reason why I checked exhaust gas in coolant. It is not a problem for me to remove cylinder head and change gasket with alignated head. I have Romero, maybe alu engine block started to play but I want to wait for warmer day.
Last time I changed cylinder gasket in V8 in two parts. One day after work left side because I need car to work, next day second side but it was old Range Rover
EDIT: Expy has clean oil and no butter inside valve cover oil cap.
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