Dreaded Engine Malfunction Reduced Power

[mswaz]

So at 25009 miles started my car up this morning and all fine with normal cold start at 1500 rpms then the drop to 800 backed it out of the garage and got out to clean the windshield within 5 seconds the car started shaking and sputtering violently, got in the car and had a check control message stating engine malfunction and reduced power. Turned the car off and let it sit for a minute. Restarted fine drove it around the block, Check engine was still on but seemed driveable but little power but it was smooth. Pulled back up in front of the house and put it in park. engine started immediatly sputtering again and car began viloently shaking. Placed in drive and would not smoothly drive forward. Turned car off and called BMW assist. Car was flatbedded to dealer as undrivable.

So seen many posts over the years with this problem and did a search but anyone with experience so I know how to respond to the dealer would be appreciated. Was anyones expereinces similar on an X5M and what was the cause and remedy?