Well, after trying to make it work...the 6530 (6al-2 programmable), I still have the same issue. After talking w/ MSD tech, they finally agree w/ me that the box itself has a problem. It only does it when it gets hot...not the car itself running hot, but push it outside in the heat of the day for a couple hours and it'll do it. I drove it on a cold day and the car runs perfect. Let the car sit outside on a hot day and then fire it up and it instantly has the 4500 rpm misfire/rev limit. So it's on the way back to MSD for another inspection.
In the mean time I have put all the old analog stuff back in the car (6AL, 8987 start/step retard, 2 step, etc.)
Heat can do funny things. One bad solder joint. To bad you did not monitor the actual box temperature when it acted up. Then you could tell MSD to heat soak it at that temperature for testing.
