Make sure it's getting full 12V not reduced voltage in the ign2 "crank" brown wire circuit and in the ign1 "run" blue wire circuit. when adding MSD I'm not sure if you bypass the ballast on strickly the coil ign1 "run" blue wire circuit IF keeping the original coil. I think there was some good info posted on this awhile back. Anyone? Does your 87 dak have a regular type electronic ign (ECU/ballast/2 wire dist pickup)