nomodsjk

So about 5 weeks ago this problem started... I'm driving around 30 mph and then the tract ion control light comes on and I loose power to the throttle and can't change gears. I turn the car off and back on again and drive off like nothing happened. Over the next couple weeksit happens on and off with no real rhythm to explain it. My local Nissan dealership said they co uldn'tfigure it out. I took the car to R/T tuning in Lansdale PA to get a custom tune and they said it was the tps sensor on my passenger side throttle body which I replaced three days ago and the issue is still there. Someone please help!