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Its hard to say what is your car's problem. But... on these N54 cars... any miss fire will really make the car shake... sometimes it feels like you are running over something with the wheels/tires... but its the engine thats vibrating - missing!
You did not say how many miles(kms) are on your car? Could it be marginal spark plugs? Or it could be a bad fuel injector or HPFP? ???
The more info the better we can help you. But you should first try contacting your tuner - and see what they say.
You might even want to put the car back to stock and see how the car drives? Do you have a BT cable for any CEL codes?
Good Luck
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