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I am driving a 2006 525i with approximately 125,000 miles. Over the past few months, several issues have occurred. When I stop at a light or stop sign, the car has an EXTREMELY rough idle and acts if it wants to shut down. The car literally shakes. Also, I have noticed that there is no power during acceleration.

I initially thought it was a spark plug or coil issue. Installed new plugs. No change. Pulled each coil one by one and engine lags when each was removed. Also, grounded each coil to see if they were sparking. All were sparking.

Other ideas would be greatly appreciated.
 
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