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Hello and welcome!My name isCustomerand I can assist you with your question.
Have you checked the fuel pressure when this hard start condition occurs?
So we dont know what the fuel pressure is at?
I would check the fuel pressure sir. You could be leaking fuel into the engine through one of the injectors or the fuel pressure regulator. This will cause the fuel pressure to leak down with the engine off.
Another possible cause would be a faulty cold start injector or a bad engine coolant temp sensor.