I decided to try using 2 separate power supplies, their only connection was the ground on the Jstim. This made no difference, surprisingly.
I then decided to just trigger the coil by itself, that worked fine.
Then I noticed if I ran the MS by itself, not connected to anything, the noise from the coil would reset it. To be clear, the MS was running on jus tthe stim and a separate power supply, no serial cable or anything. The closer the coil and spark plug are the worse the resets. I then made a 4' cable to run the trigger signals and it works much better, however still resets allot.
Next was to run MS from a 9V battery. No real change, it still resets! Seems like the MS is exceptionally susceptible to the coil noise. Another thing I noticed is that the faster the RPMs the more it seems to cut out, but it's not a linear thing.
ANy suggestions or ideas?
Next, the coil gets pretty hot, pretty quickly. I've tried inverted and non, and until I reduce the dwell to ~1.5ms, the spark intensity doesn't change much.
Obviously don't want to bolt this on the car until I understand what's happening.
Looks like there is better support for this in MS2, and obviously MS3. Now thinking MS2 upgrade may give better control on the dwell, but might just be confusing things...