Ok on one of my Cutty's when ever my car is not in gear it idles real high and then when you put it in gear it idles too low. It is a 307 motor. I just need some ideas to what it could be. Any help would be great. Oh and yesterday I heard a pop and then my car started running real fast until I shut it off. I messed with the 4bbl on the carb. and it started to idle low. Nothing seemed to be missing or messed up so if anyone could help that would be great.