Have a compression test and a cylinder leakdown test done when its cold. Valve recession can cause power loss and misfire when engine is cold and it will come good as engine warms up, although valve recession is rare in AU petrol engines but still possible.
What sort of condition is the inlet manifold gasket in, sometimes they crack and get sucked into the path of the injector spray, good quality injector spray pattern is critical for cold start.
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