I have a 2000 Taurus 3.0 Vulcan. The car blew a head gasket last summer, didn't really overheat much before i caught it. I replaced both head gaskets and the front head just to be sure. The car ran great since. Then I was driving on the freeway on cruise control at 80mph and everything was fine then all of a sudden the car lost power and started to slow. It started to downshift into passing gear so i knew something was wrong, when i put my foot on the gas it was floored by the cruise control. I pulled off and the motor was missing and the light was on. I drove it home and checked the codes and it had p0302 and p0305 misfire. i cleared the codes and restarted it and now p0302 went away and only p0305 remained. i pulled the plug for cyl 5 and it was bridged with something, so i cleaned it and put it back in and now i still have a slight misfire. i tried switching plugs and wires, checked the coil, replaced the fuel filter and injector. i did a compression test and it showed a low cylinder. cyl 4 110psi, cyl 5 60 psi, cyl 6 110psi. my question is the car ran great up until that point, what could've happened just driving on the freeway to lose power and make a skip. its just a slight misfire at idle but still runs great. light keeps coming on cyl 5 misfire. I have to get it smog tested, will it pass?