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The original posters most likely cause of misfires when cold start will be due to tolerance issues with intermediate levers. All E53 2004-2006 X5's 4.4 and 4.8is will develop this problem. Most common mileage is around 60,000miles depending on driving habbits. What happens is the intermedite levers become worn out, and during cold start, uneven cylinder filling will cause misfiring. When the misfiring occurs, and engine is running rough, the engine becomes warmer. The driver can then turn off the car, and restart it and the engine will run fine.
The correct repair will be to remove both valve covers and both timing covers. You can leave bank 2 timing cover on to do the repair, but since the timing covers are known to start leaking at 80-90k miles anyway, you might as well remove it now and replace them.
Once the valve covers are off, you will be able to use a mirror to check which classification levers you will need to order. There will be 2 different sets of 8 levers or just 1 set of 16 levers to order. Both cylinder heads may use the same class, or one may be different.
BMW's repair procedure when this first occured on 2002 E65/66 745i's was to replace the levers only. During trial and error, it is now advisable to replace the eccentric shafts during this time with the levers. I have attached a parts list, and tool list.
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