96 Mustang Gt has a theft light problem. It's not a constant problem, the light will come on randomly most of time it comes on when I first start it. It flashes repeatly. The car will start, but it runs very rough. Sometimes so rough it will barely drive. I can eventually get the light to shut off, and then the car runs fine. Then today a new problem started...afterthe light shut off the car still ran rough. After I unplugged the mass air flow sensor the car ran fair, not good. Replaced the sensor....still running rough. Any suggestions?