I have a 2001 Mazda Protege ES 2.0 5 speed. I was pulling off the highway into the city and came to a red light. My car stalled and would not restart. I towed it back to my shop and began troubleshooting. Fuel pressure seems good. Spark seems good. Was just cranking over then the cranking sound changed. Still wont start. Can anyone suggest what might be wrong or what I might test next? Any help is greatly appreciated.