Hi all! Need some help and advice. I have been getting codes:

P0363 misfire deteced- fueling disabled
P1357 misfire cylinder 8 with fuel cut off
P1345 misfire cylinder 2 with fuel cut off
P1355 misfire cylinder 7 with fuel cut off
P1349 misfire cylinder 4 with fuel cut off
P1351 misfire cylinder 5 with fuel cut off
P1347 misfire cylinder 3 with fuel cut off

So I understand that I need to replace spark plugs, but I read that it could have something to do with my ignition as well. Can someone shed some light on what this means? Also from reading on the forum I saw that some folks replaced spark plugs and still had the codes. Anything else I need to do or to look for?

Thanks in advance.

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X5 4.4i DOP:07/03