Having some trouble with my truck running lean. It’s a 2011 f150 5.0 fx4. I’ve ran a smoke test for vacuum and couldn’t find any leaks. Also checked out upstream 02 sensors and they seem to be working as normal. Cleaned the maf and checked it for leaks it seems to be working fine as well. The only thing I haven’t been able to test is fuel delivery, but the truck runs perfect and idles well. I’d hate for it to be a fuel pump or injector but the engine only has 45,000 miles on it. The truck itself is closer to 170,000. Is there anything else I can do or check besides fuel delivery? And would it running so well point to anything that’s not related to fuel delivery? I mean it idles and stays between 590-605rpm it doesn’t change from that.