Just fitted a L3e out of a lighting unit into my ec15b runs perfect but revs are going up and down when throttle lever is all the way open so I took the plate off that holds idle and fast adjusting screws and I can see the throttle lever moving side to side which is making the revs go up and down fast so if I hold it it revs perfect but as soon as I let it go it starts to move side to side again any ideas please anyone thanks