so i was cruising in my 60 flattop when a small vibration began. i didnt pay much attention just figured it was do to sitting for a year. i took it donw the highway and the car would not speed up , at all. i got off teh freeway and noticed teh small vibration had turned into earthquake size shaking and rattling. the car will not speed up and wheni give it gas it hiss, rattles , goes a bit, then slows back down. i am pretty savy with cars, so i know most often when something is up. but this time, there is no smoke, there are no knocks, no pings, no leaks, just no power, almost as if it is getting no compresiion. has anyone had this happen before? what is the best course of action? what does it sound like to you guys?