Bmw miss fireing and spluters

Starting with the basics, as long as there are no warning lights on the dash you can be rest easier knowing that possibility of it being an expensive repair are slim. Normally on these cars if its a serious engine fault the DME would have recorded the fault and most commonly a light would have appeared! If this is the case, then i would start with the spark plugs!

To gain access to the spark plugs, remove the engine cover (2x 10mm nuts), you might have to remove the oil filler cap in order to get the cover off. Pull off the H.T leads and finally to your plugs. Check the electrode and the gap, the state of the plug, does it have oil around it etc. With the spark plugs off be careful not to drop anything into the chambers!

Hopefully this should cure the problem and is prob the most cheapest fix that you can do yourself! So it makes sense to start with that!

Hope this helps