Freelander 1 random power loss

I have a 02 freelander S v6. A few weeks ago I was on my way to work going up a hill when all of a sudden I lost all power like I wasn't pushing the pedal down so I pull over. Put it in neutral revved it up and it was hesitating. I turned it off for a about a minute started it back and it ran fine. Runs OK now but when I drive on the highway for a while it does it again. Check engine light is on for lean bank 1, misfire cyl. 3 and the vis motors.