help, dodgy vs ecotec idle

[danbran]

it fails to drop back down to its usual idle, its a pain because it likes to sit between 2000rpm-1300rpm, sometimes it is normal but not often. with a massive rev up to nearly redline it will drop back down to normal idle speed but i dont like doing it. To me it sort of sounds like a leak somewhere of vacuum or intake or what ever! but anyone else got an idea?
thanks a lot all advice appreciated

 

[Wozza]

Hi try a pcm reset see if that solves it (works some of the time )...normally when this happens its an IAC issue so a start point will be ripping off the throttle body and giving it a good clean,also make sure you have slack in the throttle cable at the throttle body

 

[danbran]

Thanks wozza! i did that as you said then as i was just doing a double check on the engine i found a vacuum hose had just popped off! so i think that may have been the problem, thanks though