What tips and tricks are out there using EFILive to help us search for vacuum leaks? I once tried the trusty propane method, but the idle didn't change in the slightest bit even when I was pumping propane straight into the intake through the PCV port. I was told that the IAC is compensating too quickly (maybe the IAC needs to be unplugged?). Other suggestions were using carb cleaner or WD-40 but what a mess and I can't see carb cleaner being good for the intake gaskets.
What I'm imagining is logging some parameters (not sure what) while I go around the intake with propane or something else. And if there is a vacuum leak, there would be an obvious change in the data. For example, maybe the O2 sensors would flatline with propane, or maybe there would be a slight drop in MAF... I also have oxygen and acetylene I could try if those would yield better results.
Anyone know how we could better utilize EFILive to search for vacuum leaks?