I agree with blue. The "correcting" of the vacuum deviation would suggest that the problem is not static, and lifter sticking can do this. I would sea foam the intake and crank case to see if that makes a difference. From personal experience I can tell you that this can fix sticky lifters so long as nothing mechanical is broken.
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2000 Box Base, Renegade Stage 1 performance mods complete, more to come
When the owners manual says that the laws of physics can't be broken by this car, I took it as a challenge...
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