I read somewhere that engine vacuum can be a good window into an engine's condition. I was poking around on my explorer and decided to hook up a vacuum gauge. It looks good, but I was wondering if there needs to be an adjustment made for altitude. I get a vacuum 15-16 in Hg at idle, it goes down when I accelerate the engine, and goes up when I let off the throttle. Considering that I live at ~5000 ft above sea level, is that a good vacuum? Also, I picked up some vacuum tubing today, so I can run the line into the cab and monitor the vacuum while I drive. What can I watch for that would signal trouble?

The way the vacuum is responding is normal. At idle is the vacuum steady between 15-16 or does the needle jump rapidly?
If if is steady that is normal. No adjustments on EFI the computer controls everything.

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