If you can’t find any manifold leaks, check the fuel injector seals. When you pull off the fuel rail it should take some force to pull the injectors out. If they come out easily, replace the seals bill
I had an issue very similar. Replaced same parts just like you. Symptons pointed to leaking intake gasket BUT it turned ot to be leaking fuel injectors "O rings" seals. Been perfect ever since.
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