jason ezell

I have a 2008 gmc sierra with the 6.0 and about 110k. The other day at work I went to move the truck and it acted like it didnt have any power when pressing the gas. It finally scooted up a small hill to where I was going and I shut it off. After work when I was leaving the truck needed me to press the accellerator to get it to start. On the way it seemed to do fine until i came to a stop and proceeded to go again. When trying to take off the truck bugged down and took a couple light taps of the accellerator to get going. After this it drove fine each time except at high speed when passing seemed to lack power. I have the truck at home now and it starts but take a few seconds of cranking before it fires up. Once started it idles fine with a bit of a rough idle. When the accelerator is pressed lightly it revs up but seems to cut out if given too much of a push. I replaced the spark plugs, fuel pump and maf sensor thinking it could be either of those from past experience. Fuel pressure seems ok, i put a guage on it and it was 45 before starting,jumped to 55 when cranking and 60 when running. I have access to a tech 2 at my home but have no clue where to start with it, but would be happy to pull any data from it you may need.