same old problem I have been throwing parts at for over a year now.. 2006 Columbia with 14L DDEC-V, am I correct in saying the fuel pressure on this engine should be around 15psi idling and around 25psi at 1500 rpm? I have had a few different stories on this, including pressures up to 65psi, but my local Detroit shop told me these numbers were correct for the ddec-v so I have been leaning this direction. I have made a few posts over the last year concerning this skipping problem I cannot fix. Without getting into that, I found out today after putting a fuel pressure gauge inside the truck while I'm driving it, that it will not go over about 18-20 psi under a full throttle load all the way up to 2000 rpm's. Could this cause the engine to skip because of lack of fuel? To me, it seems that if my fuel pressure numbers are correct, I'm about 8-10 psi too low... I think the truck should just be down on power, not skip..? Any info is appreciated!