BMW not running right.?

The power keeps coming and going. Foot to the floor in 2nd and its just moving then bang the power comes back. mad noise coming from exhausts its like its bloked.

Answers:
it sounds like the fuel air ratio is all over the place, and unburnt fuel in the exhaust is then igniting. I presume its fuel injection and therefore needs a garage diagnostic check but you can start by checking that the air filter is fine, try blowing it through with an airline and giving it a knock on a wall to remove dust and muck
go see the BMW workshop agent. they always know what to do.

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