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      12-29-2012, 02:06 PM   #3
A_P
Lieutenant Colonel
United Kingdom
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Drives: E46 M3
Join Date: Mar 2012
Location: South East

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This is way too vague bro.

At a guess could be anything from traction control kicking in.

Coil pack or spark plug misfire... check ur software for bad cylinder.
Fuel filters.
Fuel Pump.

Or a wild guess here but could be muscular spasms of your leg.