ok so i got a 2000 grand prix gt and it wont start it killed like last week when iput itin revs then wouldnt start agine so came back after work starts right up started taking it back home ( like 1.5 miles and it dies like mile in to the drive then had to pull it home) but i replaced the crank senser bec i had that code back when i replaced the o2 senser also replaced the fule pump wich didnt chage anything so im suck bec i have air spark and fuel(wich is now in the oil from fluding so now gota chang oil too.....but ya so it cranks and will fire maby 1 cylider but thats it. any help?