will be the A12xer lump in it with it being a 61plate. have you pulled the air filter out too make sure it's not wet? also pull the grey fuse board out the UEC and see if the wires are corroded as this can give throttle problems if there is more then 2 wires corroded then you need too replace the body harness.

disconnect the battery before you pull the body harness fuse board out the UEC as you need too undo the 10mm nut for the live on it aswell. just undo the clips on the side and pull it up an pop the black shroud off the bottom