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.