could someone help me? My 7mgte has starting problems. Just had the motor rebuilt and trying to start it. It starts but after running 25 to 30 mins. it gives me code 14. I chked ignition system everything seems okay. But when remove pluggs they are black like they are not firing. Car will not start, but when chg plugs again the car runs for 20 or 30 mins.again and stops again.Same thing over