Carb problems are dificult sometimes, especially for those of us who have gotten used to fuel injection. I had problems with mine on my 250. I ended up getting a rebuilt one. If you decide to go that way, Auto Zone sells a Holley rebuild of the Carter YFA that you have for $119.95 exchange. That may end up being the best way to go depending on the mileage that your's already has on it. You should still check the EGR valve, too. Mine was FUBAR and it made the car run like, well you can guess. I blocked mine off and it corrected the problem. A new one goes for $40-50. Back then, they weren't made for economy, just part of the emission system.