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87 924S Rumbles at 1600 RPM

  • 1987
  • 928 S4
70 000

When I drivce my car it "rumbles" as I accelerate past/through 1600 RPM.  It is a loud rumble and has been consistently happening this calendar year.  The carr is driven roughly 1,000 mile per year.  I can't tell if it a transmission issue or engine issue.  Any clues?

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