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91 780 turbo issues 700

turbo won't spool like it used to
Hello. This is my first time asking a question that has me stumped. I own a 91 780 that ran like a champ and it started to idle up without warning at times. Other times it is fine. While driving it the last time the turbo stop making boost and it felt like my brake booster died. Any ideas as to what it can be. Thanks for any assistance. I also own a 88 740 turbo, 89 740GL, 90 740GL, 01 XC70.






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