ok i ve got an 89 mustang lx 302 rebuilt cam twin turbos.......car has no spark..coil has power to the pos side....when u turn the car over it drops.....when testing the power from the coil wire on the tfi module it has very low power but no power when cranking comes back when stop cranking......msd 6btm box and msd tfi coil factory dist. need to know y i have no spark???