I have only had this car for a couple of months now, and the engine seems to be miss firing on any of the following cylinders. 2,4, and 6. i looked at the spark plugs and they all had the .040 gap. Some of the plugs might have been a little bit lose but i fixed that and its still miss firing. Now, where do i go from here? Should i change the spark coil and the spark plugs at the same time? or is there another reason why the car is miss firing. Im wasting way to much money on gas and i would like that to stop haha.