It could well be an inlet manifold that leaks!
If the manifold leaks, it can leak to the outside and to the inside, via the inlet valves.
If the car has been standing for a long period, it is possible to have a bit of water in the cylinder(s).
That would make the engine difficult to start, the idle lumpy and produce some smoke (steam) but should clear as the engine runs.
Let us know what you find.!
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Worth his V8 in gold
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