Hello I have a 07s Automatic. at 40,000 miles my engine light came on and was running rough. Minni said I had carbon build up I asked how they deal with it and they said the manually remove it. I now have 45,000 miles and the light came on again and its starting to run rough. Is this somthing thats going to continue. I use 93 octane and Im not shy with the throttle. Is any one else having th esame problem. Or has anyone been able to fix this for good