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At 3,000 RPM your engine should sound like it's screaming and that something is wrong... a stock VX just doesn't sound right or happy with the engine going that fast, your gas mileage will also suck.
It sounds like the tube under the intake manifold that you are talking about is the PCV tube, that has a grommet that often drys out after 20 years and allows extra air in the engine, most of the time it just causes idle bounce, but if it's in poor enough shape that it's collapsed then it might also have a big hole ripped in it, or be gone all together.
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