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  1. 2003 - 2004 Mach 1 Mustang
    Hello guys, I swapped out my seized engine in my 03 mach1 with an automatic for one out of a 5speed . I got the eight bolt flex plate put it back together and it will not start. I get a anti theft code. Had the cpu reflashed and still will not start. Has anyone had this problem? HELP!!!!!!!
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