started out when my car started to squeal. thought it was the belts so i replaced them. Still squealed. So i was giving my car a tune up and found one of the plugs was extremely loose. Put the new plugs in and the problem went away for 2 weeks. Started doing it again so i checked the plugs and they are all tight. But it seems like its misfiring only when it gets really hot out. It does it during idle and when accelerating.