The car out of nowhere started idling/shaking rough, then as i'm going it sounds like an exhaust leak... its defenetly not as fast as it was before. the reason why i think it may be a burn valve is because it got pretty hot a couple times within the last two weeks because i forgot to turn on the electric fan and it was somewhat low on oil. anyone know if this is the case? either way i have a freshly rebuilt motor going into it but this just means i'm going to have to get it done faster.