i was cruising on the highway and all of a sudden i heard a big "POP" and then my car turned off in the middle of the road. it sounded like an explosion or something and it also sounded like it came out of the muffler. when i tried to turn the car on there was white/grey smoke coming out of my air intake/intake manifold. when it turns on, the whole car shakes. it sounds like crap. the only thing i hope is that nothing happened to the block. what do you guys think about this. any suggestions. what im thinking is that it may be something to do with the valves, but then again i would like to hear your suggestions. thanks.