Did you ever figure out the solution for your problem below? I have the same problem.
Did your symptoms first start with intermittent loss of power while cruising? My 2008 S today started to act a bit weird. First I was crusing at about 60 on the interstate when I felt a loss of power. It was as if I was coasting for a few seconds. Then everything normal. Pulled off the interstate and had to stop at an intersection. When I went to go through the intersection, there was a loss of power. The engine did nothing for a second or two, even with the throttle to the floor. Then a bit of a burble and then it roared back to live. Since I had the throttle to the floor, I roared through the intersection like an idiot. Then crusing about 30 mph it lost power a couple more times. Same thing...loss of power for a second and then it seemed normal.
