Im over from the 12V side but my buddy needs some help. He took his SRT10 viper powered truck up and traided it in on a 2006 3500 megacab with the 5.9L and 6 speed stick. The truck pulls decent but falls on its face around 2300 rpm. Heading out of town up a VERY slight grade with his foot to the floor in 6th gear the truck will only pull 75mph and 2300 rpm. You can lift your foot off the throttle about 2 or 3 inches and the engine doesnt respond at all. Also when you push the clutch in and floor it, the engine revs to 3400 or so but when you let off the gas the engine remains at 3400 for a few seconds, like 5 or 6. It acts as if its in a valet mode or something, but the dealership said nothing about it having a programmer in it. Back to town downhill the truck will eventually reach 90mph, but it takes a while. My buddy is way bummed out, but I told him the guys on the forum will help us figure this out. Any Ideas??