[LX5liter]

Does it start O.K. after sitting over night? Or is it just hard to start after sitting for an hour or so? It sounds like you may have injectors leaking down into the cylinders and basically flooding the engine. Next time it's acting up, try holding the fuel pedal to the floor while cranking the engine over, this tells the computer to shut off the fuel when your cranking it. If it starts up fine that way, time for a new set of injectors, or you can just live with it like that.