My Mazda 626 is a 2002 and has 65,000 miles. I had the oil changed about ten days ago. Five days ago, the engine light came on for half a day, then went off. This morning, I drove the car with no incident for a period of time. During the last ten minutes of driving, the A/C stopped cooling although it was blowing and all indicators said the A/C was turned on. I parked the car, took a twenty minute break before going back out. Turned the key and the engine makes a brief, quiet turning over noise as though its grinding to a halt. Tried it a couple of times and left it. What are the possible diagnoses?