my car sputters like its running on 3 valves. I left the car on, went to the engine and started checking the valves starting with #4 to see which one it was. Valve #3 is the problem. I can pull the wire out and the sputtering will stay the same. So I was thinking it was the spark plug so I bought new spark plugs and replaced it, but no difference was made. The only difference is if I take out the spark plug and put it back in and turn the car on, it will run for a few seconds and then start going bad. I switched around the wires to test if it was the wires and it didnt make a difference. I replaced all the spark plugs a month ago and found oil in #3 and 4 all over the spark plugs. But once i replaced the spark plugs everything was fine. Now its doing the sputtering and replacing the spark plugs makes no difference. Does anyone know what this could be?