If I remember when I had my 2.3 16 cold rough Idle could be a couple of things one could be fuel pressure at the fuel distributor or a bad overvoltage relay one of the fuses might have blown
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The Daily: '13 Boss 302 Mustang (444hp)
Past rides
2013 Mustang GT 5.0 track pack (420 hp)
1974 DeTomaso Pantera (300 hp)
2007 Parnelli Jones saleen (425 hp)
2008 GT500 (650 hp)
2006 Mustang GT (360 hp)
1967 GT500 clone (500 hp)
1987 2.3 16 Cosworth Mercedes (190hp)
1976 Turbo Cosworth Vega (300hp)
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