it needs a throttle body the problem isn't the butterfly sticking .. it's the pedal position codes .. which is the sensor that the throttle cable runs on left side of the throttle body... sensor fails and the car just goes into a limp home mode 10 -15% all xj and xk will need a new one.. 6-7 years they fail.. you can get a used one but may happen again and you don't know when .. and no one in the world sells the sensor separate. $1900 is cheaper then in canada .. here they are $2700 .If you get a used one make sure it is from a car 2001-2003.