The obd2 softwate isn't exactly what you need.

What you really need is a smoke/pressure test of the intake tract to pinpoint the vacuum leak.

The UIM/LIM gaskets along with the PCV valve/hose are your most likely bets.

Steve

98 Contour SE Sport 2.5 Duratec ATX The wifey's car 89 Taurus SHO - 246K miles 94 SHO ATX - 190K 1997 F-150 5.4L ATX - The Workhorse 150K. ANY THREAD WITH "OMG" or "WTF" ETC IN THE TITLE WILL BE IGNORED!