ok well heres my take check your tranny, i had this old maxima a long time ago and well lets just say i banged the hell out of her, but i noticed after a while that i couldnt get up and go it would just rev go a little then catch a little later so i took it in and it was my tran. i had clipped off all the teeeth in first and second just about, and was starting to kill third, got it fixed for a mere 800 later, if i knew then what i know now, but that is one of my few ideas the MAF idea is a good one too check and clean that, also did you check your intake hoses to see if you have aclog in em or if one may be loose or anything

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"IF IT CAN BLEED, WE CAN KILL IT"