I was driving my 91 mustang for about an hour. even sat in stop and go traffic for 30 minutes. Everything was absolutely fine. Turned the last corner to go home, and the car seemed to sputter as if it was gonna run out of gas (As I knew the gas was close to being empty), so I immediately went to the gas station, left it running while putting gas in it. Drove fine to the gas station, idled fine at the gas station, when finished and went to pull away from the gas station, big sputter & backfire, and complete power loss. Regardless of rpm, load, in gear or in idle. I sputtered and backfired around the block to the house never getting over 3 mph, never get any rpm up, just bump along and not trying to stall. This was late at night. Next morning got up, cranked the car up and same things. Please advise, cause I have no idea where this even started!!!