Had a blown head gasket...So I tore it down and replaced both sides. put it all back together and ever since i did this. I am getting a Code 23 (I assume if that is what 2 long blinks follwed by 3 short ones is) that I wasnt getting prior to the tear down. The Code 23 says left bank. So I replaced it and still get the code even after clearing the ECM. Car also has just quit running while driving a couple of times since then as well. All the times where at different speeds. So I cant figure it out at all. oh yeah The harness for the 2 Knock Sensors test out good...Any help would be greatly appreciated!