Rough idle due to broken vacuum hose near power steering pump on Volvo S70

A broken vacuum hose near the power steering pump deteriorates and can cause a rough idle and the Check Engine Light to illuminate

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Average mileage: 179,000 (179,000–179,000)
Engine affected: 2.4L 5 Cylinder
2 model years affected: 1998, 1999
3 people reported this problem
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problem details
1998 Volvo S70 - 2.4L 5 Cylinder 179,000 mi,
Engine idles rough rpm speeds up then goes to shut off then speeds up then shuts off. Loss of power.