I need some help. I completely love my custom 1998 Mustang Covertable GT with a shaker hood, cobra seats, lowered, ground effects but am experiencing a problem this year that I can't seem to fix. The car starts one time and then the next it goes into Theft Mode and will not start. Later, it will start again, but next time goes back to Theft Mode. Has anyone experienced this before? How do I fix it!!