so my Protege5 will not go over 45 miles an hour and sometimes 25 miles an hour. it just revs rpm when it gets to any of those mph. i changed the spark plugs, spark plug coils, spark plug wires, head valve cover gasket, timing belt, water pump, tension pully, both serpentine belts, 3 motor mounts except the back one (dont know how to get to it), 02 sensors, transmission valve body and solenoids, transmission speed sensor, camshaft position sensor and all the fluids. I dont know what else to do on my automatic 2002 mazda Protege5 2.0. help please. oh and i dont know if the overdrive has anything to do with it or not but i dont know if its working or not. is there a light that tells you if its on or off?