problem fixed, it doesn't stall and sputter anymore, all i did is change the fuel filter and did a fuel injection flush,but now it's kinda idling high around 950-1000 rpm, it idles 950 rpm stop at the stop light foot on the brake, and if your just coasting in neutral it flactuate around 1200 rpm then go back to 950-1000 rpm when stop and foot on the brake, i tried adjustng the idle by turning the screw which is located on the TB but it still idles the same the screw cant' go any further, and by the way i turned the screw the right way to lower the idle cozif i turn it the other way the idle will go higher,but anyways the screw is turned tight to lower the idle but still idles the same, is that normal?