hi all i have a 2wd sapphire the problem is that it has an idle problem and has a splutter when you are at a constant speed it doen't hunt when idleing its poping out the exhaust and feels like it wants to cut out but then fine again for a second if the ambient air tempreture sensor is unplugged it runs like a swiss watch the fueling has been checked through the rev range and is fine it its got a new at sensor wt sensor and crank sensor but made no diference plugs cap and rotor are also new