Ever since I installed the MSD 6A on my car it has had a slight miss at idle. Kind of like; mmmmmmmmmm,boom,mmmmmmmmmm,boom,mmmmm.... you get the idea.
Note: The MSD fires just the leading TII coil. The Twin Power fires both leading and trailing.
I have both a MSD 6A and a HKS Twin Power wired for use so I decided to do a little experiment with my Gtech Pro, (and yes i know the Gtech reads low and does not account for aerodynamic drag).
These runs were done on the same afternoon with the only difference being that I added 100lbs. of fuel before the green and blue HKS runs.
Barry