I am having this idle problem it runs fine while driving sputters and dies at idle."sometimes".I have cleaned the throttle body,checked the air filter,mass air flow sensor and replaced the fuel filter.Took the truck in to the shop it is coding lean on bank 1 and 2. I cant seem to find a leak in vac lines.Where do u happen to find your vacumm leak.I have a 2004 5.4l v3 4x4.Please help