Electrical problem?

Hey everyone, I have a 1970 340 Dart with a MP electronic distributor, MSD 6 box and a MSD blaster coil. I hooked up an MSD tach adapter and used the white wire for the tach trigger instead of the grey like I should have and ruined the Box, I disconnected the tach adapter and put in a new 6 box, the car starts fine and runs till I slow down then it shuts off, it starts back up and does the same. I checked the carb and its getting fuel. I checked the coil and it is with in specs. The car was running fine before the tach adapt fiasco. Thanks for any help.
Jeff