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it's called buy Fuel Injector Cleaner.......
you could get fancy German stuff from Performance Products (Ventil Sauber) or just Valveline Fuel Injector Cleaner from Autozone.
Run a few doses of that and go for a good hard drive on the freeway and you'll be good.
Get a second opinion as well. Sounds like these guys want you to grap your ankles.
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