I have a 1996 ford ranger supercab and when i sont even have my foot on the gas it still idels between 25 and 30 mph and it also spudders sometimes

Don't do this with your truck in gear but if you can get the engine to drop down closer to a normal idle by tapping the accelerator pedal, it is probably just a case of dry linkage under the hood. Use a lubricating spray (no WD-40, it evaporates) on the linkage you see moving when the accelerator pedal is moved. A weak return spring can cause this too but is a less common problem.