I have a 1997 cougar 550 that is intermittently firing on one cylinder. Both cylinders are getting gas and have spark. The carburetors are both clean and I have swapped them and it doesn’t follow either carb. The misfires will happen In either cylinder but is independent of what carb is where. Sometimes the sled will run great and fire both cylinders but sometimes will go back to only firing on one. I am thinking stator but would like To see if there are any other possibilities before I replace it.