Re: msd ignition
I had this same problem these can be very frustrating mine ended up being the High rev RPM port was bad no matter what chip I put in it would do the same thing than I ran a run without a chip and the problem went away. I send the box to MSD got it back after they said it was repaired put a chip back in and it did the excact same thing finnaly I just replaced the box and never had a problem since.
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