have a 6al digital box / coil / distributor all MSD. engine will not fire and put in back up HEI and no problems with same wires. we have spark at the coil wire at cap. spark at plugs at random. new cap/rotor and pick up. pluged new running box from other car into ours and same thing. called MSD but that was a joke. have never came across this in my 30 years of racing. check all power and grounds can't find any broken wires. good whit/blue spark out of coil. rotor to cap contact is fine. any one ever ran into this problems or have any idea what to check next. running on HEI right now but really need my msd back \. thans for any help.
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