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2005 Subaru Legacy GT 5MT

Having an issue where my Subaru feels like I'm driving over a constant rumble strip. Thought it may have been a spark plug issue but changed those out and still not fixed.

Here are the symptoms:

  1. Most noticeable during acceleration/deceleration (applying/letting off the gas) and primarily on non-hilly roads, at higher speeds
  2. Is the absolute worst when on cruise control coasting on a relatively flat surface at 50-70 mph
  3. Not noticeable in neutral while coasting or while going downhill
  • Possible cracked exhaust heat shield? My Subaru is having this issue right now. – WeakMech Jul 29 '18 at 23:48
2

Turned out it was the driveshaft.

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