07 Mitsubishi Outlander. 225,000k, 3rd timing belt not due for replacement yet. Spark plugs changed 40k ago... car has been running well. I started and drove the car this morning as usual. Shut car off for a brief 5 minutes.. upon restart, car would barely keep running and would eventually stall unless given gas. Was idling at about 400 RPM. Drove car to AutoZone where they got a p0300 misfire code. Nothing more specific then the general code. Does anyone have an idea what this might be?