Is there some drivability issues that you are trying to diagnose? I was listening to some pod casts by a guy from NJ that calls himself ..The Hot Rod Farmer.. one of his early careers was a ..drivability diagnostic..tech at a shop. Later he was a drag race tuner and also a technical writer for Hot Rod magazine. In one of his tutorials he was explaining using a vacuum gauge to check for an exhaust restriction. He said the vacuum should increase from what is seen at idle as you steadily raise the engine rpm. I have a 97 3800 Buick that does not run 100 percent especially in higher ambient temps. I tried it and found that when I raise it off idle it may increase the vacuum slightly. One you increase the rpm say over 2000 the vacuum actually decreases slight by a couple inches or so but holds relatively steady. I have a 99 3800 that runs okay and tried it on that one same result. In your case if you bring the engine up from idle with no load and you start at 20 in. then drop to 15 and keep going down I would say you have an restricted exhaust. What I see your gauge showing is a normal response. Could be a slight concern seeing the fluctuation. Not sure what that might indicate, maybe a valve train issue.
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