OMG! I am having the same issues! Mine started about two days ago and does it every time it sits for more than a couple hours. I took it to one mechanic and he said that by the looks of it, it could very well be a fouled up injector which I'm REALLY hoping not.
According to him, these engines are notorious for bad injectors given the fact they have no return line but idk I'm going to get second opinions before I do anything.