So I'm just cruzing down the road yesterday accelerating from a traffic light (not getting on it) and all the sudden I lose compression. I make it over to the side of the road ASAP. and raise the hood to find out that one of my spark plugs has been BLOWN OUT! The plug is still there but it is only held in place by the little rubber boot that slides over the end. So I try to put the plug back in thinking that some how it has vibrated lose, But no the treads are so F@#$ up that I can't even get it to catch. So I have a couple of questions. 1. What in the he!! can cause this to happen 2. what would be the least expensive fix ? (maybe helicoils) 3. If I have to pull the engine to fix it is there anything else that I should replace while I'm in there? (In referance to the 3rd question) I know some performance engine parts aren't too expensive, a lot of your cost is in pulling the engine. I'm not going to have a whole lotta $ laying around since I have to fix the head, but if there is anything worth the extra $ while I'm in there I might do it.