Originally Posted by d15bej8
i jus got done put'n a buddy's somewhat built y8 head on his d15 block. i got it to turn on but it jus acts like someone's pressing the gas and the idle's high...like 4 grand high. anyone kno what could be wrong? everythings connected like it should and im jus puzzled..
this is a vaccum leak. where it is comming from who knows can't tell online, but i can tell you a few common places. the iacv(idle air control valve), but that is a motr loped idle, along with the fast idle valve under the throttle body. take the intake off a cover the tb and if it still revs 4k then you have a major leak.