dude nissan afm's have this problem (my 32 use to have it), on your AFM you will actually see 4 little screws, undo these screws and then you see a connection from this little black part with 4 (or 5) metal strips to 4 (or 5) metal strips, you have to restraighten your connections points so that they all touch properly, once you do this the car should not 'cut out' as it use to on the 32 skylines........ and spraying ECC all over the AFM can help too hehe
anyway hope that helps