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This is usually caused by a vacuum leak in the nylon vacuum tubes that run from the IWE's to the vacuum solenoid. The most common area for leaks is near the shock upper support, the tubes tend to rub in this area. The leaks can be very difficult to pinpoint, we often have to use a smoke machine to find the leak. I have seen the vacuum solenoid fail, but leaks from the tubes are much more common. Here is a good video that explains it in detail. https://youtu.be/148Eal6lBX8
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