so tonight me and my wife are driving from the grocery store and the sencond spark plug from the firewall on the passenger's side came out of the head! has anybody had/ heard of this ever happening?? the spark plug's threads were fine but the spark plug looked like it had been hit by the piston or valve. I am so lost on this. i put a new spark plug back in the hole and new COP. am i just going to have to tear down this motor and rethread the head? what could have caused this??? please help i love my mustang almost as much as my wife. thanks in advance.:SNSign: