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engine shake

  1. 9-3 Sedan, Cabrio '04+, Combi, 9-3X Workshop
    I recently purchased a 6 Speed Manual Turbo X with 90K on it in amazing condition! I am noticing a slight shake that occurs every 30 seconds (lasts about 2-3 seconds then goes away and comes back 30 seconds later) when driving on the highway >50 mph. It is very strange. It isn't a very rough...