just remember that vacuum is not read in PSI, it's read in in/Hg (inches of mercury) and is normally somewhere between 17-22 in/Hg. What are you getting? Are you using the car's sensors or did you hook up an actual vacuum gauge?
What's wrong with the factory sensor/evoscan?start by getting an actual gauge.
Northern Indiana, I just googled it and I'm at about 700ft.What altitude are you (actually the car)?
Without a gauge you won't know whether it's your sensor or actual low vacuum. As far as diagnosis, you listen for a Tsssssssss noise around the intake manifold while the car is running and do a real thorough inspection of all vacuum connections hooked up to the manifold. Also, the gauge will tell you if it's fluctuating at all which can help with the diagnosisWhat's wrong with the factory sensor/evoscan?
It has been wavering a little (very minor) lately. I originally thought it was due to the fuel trims which I had scaled the maf 2 or 3 months ago for the bigger intake. I'll go outside soon and take look at this stuff soon. Thanks for the help.Couple of more questions: Are you having any actual issues with unstable idle or the car nearly stalling (or actually stalling)? Those are prime indicators of a vacuum leak.