i have a 87 chevy truck with a 454 big block in it. i am having starter difficulites i believe. i am still in high school and when i park on the parking lot it is on a slight slope and when i am done with classes i come out to start it up it makes a clanging sound twice. almost like it is skipping the flywheel teeth but i have rolled the fly wheel all the way around and no teeth are missing. also took the starter off and no teeth are missing off the gear? can anyone tell me what is causing this? i have no clue of what is wrong. Thanks!