I would agree with "bird67conv". Please say you have a Quadrajet on it, and accurately check the settings. Are you running "good fuel" in it ? Could be a simple as some "bad gas". Can you smell gasoline when you jump on it ? I would also check ALL fuel lines - blow em out with a compressor and replace them if you can, you may be getting some unwanted air or condensation from a microscopic crack in a line. Good Luck !!