[Gaz64]

Most of the problem with IDAs, IDFs, DCOEs etc is from tightening the throttle shaft levers. All long shafts will twist. Once the levers are fitted, tightened and the lock tabs knocked over, the shafts should be twisted back and check that both butterflies are seating in the bores with the speed screw backed out. The butterflies could also need some shifting around if necessary.