The newly rebuilt 5.9 is finally in the truck and running but for all the mods I have done to it, it just doesnt feel right. It doesnt pull like even a 300 hp engine would, even though I have been told by every mechanic and service person that, looking at the mods, it should make around 500hp. I am using an SCT with a custom flash from Hemifever, and it really did smooth it out when I flashed it from the stock tune, but it still doesnt feel right. I'm planning on taking it to the dealer (shudder) but I really dont want to ($104/hr). Any ideas?