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That indicates a leak in the vacuum system.
Check the PCV and look over the vacuum lines real well. One spot that tends to leak a lot is the line that goes under the intake from the left side of the engine. It has a funny elbow and it tends to leak at that elbow. The plastic will break under there and cause a lot of the problems you are having. It is super hard to get large hands in there to check it. I just pull it out and look it over, then put it back on. It is a fight to do it, but it does cuase a lot of the vacuum leaks on these engines.
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