i have a 89 toyota 4runner with a v6 (horrible engine) picked it up for 6 hundo, lady thought it had blown head gasket, ended up being 3 quarts to much oil, lots of vaccum leaks.... and a knock sensor. i installed a new one and the pig tail to the outside or intake. still throwing code and cant figure it out. any ideas, forums or past nightmares your-self?