Hey all. We just purchased a 1991 vert. On some occassions, when you crank the car in the morning, it will let out white smoke and the car has a huge misfire. It smells like raw gas. So far we have changed the coil, cap, rotor, cables, plugs, mass air and removed the cats. It's also been through a few tanks of gas. What can this be? I'm assuming that if it were to be a head gasket it would do it at all times. It might do it when the car is on the highway at normal operating temperature. I would appreciate any and all feddback regarding this issue. Thanks