as the title said I found the throttle plate was upside down I did it, its my fault, I'm the knuckle head that had the carb apart last summer when I rebuilt the top end. Could this be the source of my intermittent hanging idle? Thanks for the link last week Krannie. I decided to go ahead and pull off the carb for a good cleaning and that's when I found I had installed it upside down. Also found a small piece of dirt in the fairly new pilot jet. Anyone use a fuel filter in conjunction with the stock in-tank filter?