ok lost power again new question

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ok here we go i got an msd 6al box. im not getting any power at 2000 rpms it backfires and losses power. it was fine when i ran it without the box. now without the box hook up in runs like ****. i think my box screw something up. it has a pretty new tune up
 
If disconnecting the box clears the issue up, it would seem like you found the issue.

And thanks for the rewording. I also had no idea what you originally meant (there are many types of power).

Good luck.