First off i am new to the site i have a few questions. My buddy has a 2000 mercury sable with the 3.0 duratec 24 valve dohc. It has been having problems idleing lately when it is in park or nuetral runs fine in gear. It like's to jump from around 800 rpms to around 1400 i was wondering could this be the iac?. I am fixing the car for him if so where would it be located on this motor? Should i check for vaccum leaks and what vaccum hoses should i check?. Thank you for your help jeff.