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vibrate

  1. Engine & Tuning
    I have a 2004 bmw 320d e46 and ive noticed that when driving or idling and i rev, the car engine makes a strange shudder around the 2500rpm mark but then goes smooth once ive revved passed it, if i sit at 2500rpm it continuously shudders and vibrates. Any one know what this could be? Thanks
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