I have a 1999 K2500 with the L29 454. I replaced the 34 gal. fuel tank, fuel lines, upper intake manifold gaskets, and the cap and rotor in the truck. I also replaced the small vacuum line going to the fuel pressure regulator as it was dried out and brittle, and I replaced the PCV hose. Before doing that, the truck ran fine, but it had an extended crank time after it sat for anywhere between 5 minutes to 10 hours. I would park it when I got home from work and in the morning it would start right up like a champ. After replacing the aforementioned parts, the truck now starts right up every time regardless of how long it has been sitting, but it runs ROUGH. I looked at the live data on a scanner and bank 1 is showing extremely lean. Bank 2 is pretty much normal. I'm fairly positive it is a vacuum leak of some sort on bank 1 somewhere, but I'm not quite sure where it could be. I sprayed carb cleaner all around the intake everywhere I could to see if I could locate the leak that way, but no such luck. Any advice would be greatly appreciated. Thanks!
-Sean
-Sean