i had the same problem i thought i needed a new one but i didnt , i just went out an bought a new set of good spark plugs an it fixed the problem b/c one of them was shot an not working so try that, or just get a tune up . im pretty sure thats all it is b/c i had that same problem an it would go 1'st and 2'nd but never hit third, an its b/c it didnt have enough spark, try that though an if that dont work it prolly is ur transmission, but reply an tell me if it worked