ive had my tc in for 3 months now and ive put about 4k miles on the car since it was installed, now the converter is not acting right, it will not lock up anymore when it shifts in to overdrive and it hestistates some if i punch it down, it also rattles a little bit when i first start it up, and it also jarrs sometimes on full throttle starts, does anyone know what could be the problem here?