i was wonder how could i tell if my vacuum modulator is goin bad cuz my c-6 is takin long to shift or sometimes takes a while to shift into 3rd, the trans fluid is good i checked that already and it seems to shift into 2nd fine, but itll takes forever to goto 3rd and also i tried adjusting the modulator valve and nothin happens, im suspecting that its bad cuz the car shifts the same no matter how i adjust it anyone know anything about this