p0300 code on 2004 4.4

[X5Moe4.4]

Ok, so i have a dilema, i have a 2004 4.4 x5 with 137k kms on it. Recently i moved to Toronto, ON from Edmonton, AB and drove the whole way here, during the drive everything was fine, smooth as can be for the whole 3600 km trip. About a week or so after getting to Toronto i started having problems with a mis-fire (code p0300).. now i know that this code means multiple cylinder random misfire, so first thing that came to mind was spark plugs because they had never been changed before.

So i replaced all 8 spark plugs with NGK part number BKR6EQUP which i got from the parts department form a bmw dealer, during the replacement of the spark plugs i noticed the dreaded oil pooling around the spark plugs and knew it was time to do the VCG's. So after cleaning up the oil and putting the new plugs in, the car ran fine...for about 5 minutes.. then the engine light would start flashing again with the same code, so i thought the code comes back because the oil starts pooling around the spark plugs and the end of coils causing a short.

Fast forward to last monday, the x5s out of the shop with new VCG's and all the coils tested fine so i thought everything was fixed, turns out i was wrong and the code is back again and the engine is shaking..

Anyone ever deal with something like this? i feel like i hit a brick wall...

Again the parts that have been replaced/tested;

Spark Plus
Coils (tested)
CCV's
Valve Cover Gaskets