Ive been having issues with my 03 Ranger 2.3, im only getting like 250 miles out of a full tank of gas which is terrible cause when i first got the truck it was getting close to 400 out of a full tank. Ive changed the plugs, wires, pcv valve, and the fuel filter and im running out of things that i think it could be. Anyone have any suggestions on what else i can check?