Thanks for all of the help, this is a great forum. I was a little stumped at first about which vacuume line to use when I remembered that I have hydroboost so I ended up using the vacuume line off of the fuel pressure regulator. And I haven't reprogrammed for the tire size, I thought that just affected the speedo so I just checked my speeds via GPS and go from there. I am not looking to hot rod around burning off my tires, but i just thought from past experience that a vehicle w/ this much advertised HP would have a little more punch (thanks TM
). BTW I have 4.10 gears, the HD w/ the 6.0 didn't come any other way... I think. As far as the plugs and such go they were installed by a mechanic as part of the deal when I bought the truck. I usually do my own wrenching, but couldn't pass up a free tune up. The wires were replaced at that time. The MAF sensor code appears to be a one time thing. I'm trying to run down the #3 misfire. I will take a look at the coil connector. I am kind of leaning towards the #3 injector causing a lean condition in that cylinder. I am also curious about the knock sensors. I have heard alot about problems w/ them. When they go bad do they just stop working or do they retard the timing all of the time? I am out of town until Friday so I will have to check all of this then.
BTW many years ago I was an ASE master techat a GM dealer so the mechanical stuff is clear, but the newer control systems are creating a steep learning curve. Thanks again for all of the help. I will try to contribute when I can.