Ok my miata is a 5 speed 1.8 liter 4cyl...My car has a very rough idle and feels like it wants to stall, when i go to accelerate it looses a lot of power and feels like its gonna stall then the power will come back somewhat, but i still can't drive the car...Ive asked on here before and they said it is most likely my spark plug wires and that i should check them.. I did they look fine no cracks or nothing, they look pretty new actually, i think the last owner told me he replaced them, and they are aftermarket ngk wires so i dont know what the problem is. Its not the o2 sensor cuz i just changed that when i put headers on...And it was doing this before i installed the headers..