cylinders facing fron the front are 1-2-3-4 on the left and 5-6-7-8 on the drivers side side. That assumes you have left hand drive. The problem you are having is very unlikely that it has anything to do with MAF as disconnecting it made little difference. Did you check the plug and plug wire on no. 5 cyl? I don't use an INPS as I am all Apple but it sounds like coil is firing. What do the instructions say about the readout you are getting? Could also be the throttle body or the idle control.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas