I hope everyone has been doing well, Its been a while since I last posted. Long story short I acquired a Corvair (with a four speed). I just got the carbs rebuilt and decided to take it out on the highway. It was fine until I got off and went home. At a stoplight I noticed that it idled rough. Further down the road I was in fourth gear going the speed limit 30, however when I put my foot on the throttle the speed didn't change and the spedo stayed at 30mph. At another light when I shifted into 1st it was very sluggish then picked up. Finally I heard backfire. I had this issue before, but that was fixed with a new set of points. This however sounded a lot louder than before. I know a lot is going, but any help would be much appreciated.