my 04 expidition is not runing right wife called this morning said it was knocking and she was 2miles from work and had very little power. well i trailer it home. it will start up it sounds like a rod knocking but its not that loud. the sounds are mostly comming from the upper end of the motor like its the valve train chattering loudly. the code read #6 miss fire and rapid miss fire and code p1269 which i ahve know clue of. it only has 86,000 miles i'm hoping i don't need a new motor! can some one help me