My 2001 dodge cummins started to cut out and when I let off to slow down it will lose its prime when my comp box is on about 2 months ago and it got bad enough that I took it to the shop and they could not figure it out. So I sent my edge comp box off to see if that was the problem and they sent it back saying that it was and it worked for about 1 week but now it is starting to cut out again just when it is on.

 

Did you try grounding it to the battery instead of the intake horn? Just an idea...