if you overheated the car and you stated that it shut off. which usually means that it got so hot that the motor locked up. that could fuck your rings! and have you checked your compression yet? that will tell you which cylinder/cylinders is fucked. that is probably why its shaking. you are getting blow by like a bitch. not good. as i stated before that is crank case pressure in the bottom end coming past your rings! bottom end is possibly shot. could just be a blown head gasket tho. have you checked the coolant/oil. are either of them mixed??