Any new wire harness between box and distributor...?? I know this is a common problem with MSD components. They need to look hard at their employees' eye tests, SOMEONE down there is 'color blind'!!!
I have seen this numerous times,,took alot of 'heat' from people who insist that it makes NO difference,,,,but,, more are finding out it DOES!

If you like drag racing, support your local track.