I have a 2004 Mazda 3 2.0 with 60,000 miles. My check engine light came on and then it died and wont start again. I took out the spark plugs after i downloaded it with a P0300 (random/multiple cylinder misfire) and the number 2 plug was broken like the piston hit it. i have changed all 4 plugs and the motor wont turn maunually even with a wrench and the plugs out. any suggestions other than a new engine?