For the past couple of days i've been experiencing while diving a sudden drop in rpms. The car act as though it wants to cut off like its running out of gas, it bucks and stutters, i give the engine a few hi revs then she starts to run fine again. can anyone tell me what might be the problem

 

depends on when its happening, could be an idle bypass gone bad, bad maf, needing a new fuel filter,or a bad o2 reading........... etc