Ok I have a 99 3500,with a new lp and ip,everything is stock except the edge comp,everything is fine on the low setttings,but on 5.5 it sputters out,it doesen't die but just runs like crap,so ... any ideas on what it could be?

 

Sounds like you are running out of fuel. What does your fp gauge do at WOT on 5x5? Is it ok on the lower settings?

 

Check fp as stated above. Also check your pump wire connection. Mine would run fine on lower settings but had the same symptom on 5x5. Ended up being a bad connection on the pump wire.

Mooseman