The fuel return screen was all gunked up and I cleaned it and tried to start my truck. It still ran rough till I switched it to my rear tank. Then the idle smoothed up more. It still isn't idling perfect. The fuel bowl has a bunch of gunk in the bottom of it. I want to clean the fuel bowl and do the bb fuel pressure mod to see if that helps too. It might have clogged lift pump screens which is starving the truck of fuel. Any other ideas?