1988 Ford Ranger Flooding problem

I have a ranger and I live at 3,000 feet elevation. The carbuerator is doing something funny I think. I try and adjust the fuel-air mixture when its warm, but it still floods out pretty regularly. Also im burning through gas alot faster than a 4cylinder car should. I can look down into the (single barrel) carb and see the jets are working fine but it just feels like its lost power and the adjusting screw that I think is the right thing to adjust for the mixture, is turned almost all the way out.