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If it is ABS, when it comes and "goes," symptoms will be no speedometer and cruise control. Make sure your speedometer is also not working during these times. If so, then I'd suspect the ABS. Otherwise, I'd suspect the vacuum lines to the cruise control module. Possibly the replacement and your current issue is unrelated. All of the cruise control units in the 850's eventually develop a vacuum hose leak and stop responding.
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1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.
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