[R&S Motorsports]

I had this same problem these issues 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 couple runs without a chip and the problem went away. I sent the box to MSD got it back after they said it was repaired put a chip back in and it did the exact same thing finally I just replaced the box and never had a problem since.