I think I may have a blown head gasket now. Motor is not smoking and no milk in the oil. However I just put new plugs in and it's still missing some. More the longer I drive it. I pulled them and noticed some were darker and more of a weird yellow color. Could it be that I have water slightly leaking into the cylinders? I also noticed that my water level was down some but wasnt sure if it just leaked out the cap. What is a quick way to test? Use the test kit to check coolant for carbon monoxide? If so does auto zone sell it? Also what are good cheap head gaskets for a exploder long block? I used FMS type before. I don't remember the part number.