2003 focus (automatic transmission) suddenly made a loud rattling noise and had some loss of acceleration. Put in park and rattling continued. Shut car off, restarted the car and no more rattling, but dies when put in gear. This occurred a few times but then car was hard to start. Started once again, idled perfect, then died again when put in gear. Now car won't start. Had just changed PCV and EGR valves about 65 miles before this occurred. Any help would be appreciated