I have a blown head gasket, so far I have put in two different gasket repair kits in it and still not much has changed. The compression test showed 14.5 out of 15lbs. So I don't believe I have a cracked head. It happen after my water pump went out and my car over heated and cut its self off. I have very little loss of torque and my hp as not changed. I had exhaust smell in the my recovery tank and now it has gone to smelling like gas w no exhaust I'm pulling code p0300 three different times, so what should my next step be? Should I do a tune up for the spark plugs the spark plug wires are brand new and cylinder 3 and 5 plugs have been changed.