Hey guys! I'am new to the forum. Just recently picked up a 2003 silverado 5.3, has 71k on it, 1 owner vehicle. I just started noticing this issue when i brought it home, seems to be everyone's issue hahaha when they test drive it everything is fine and then when you bring it home all hell breaks loose but anyways the truck runs great. I have replaced the fuel filter, plugs, wires and even sprayed the throttle body out and also ran a can of sea foam threw the brake booster vacuum line that goes into the lower manifold and it still seems to have that starting issue. I have not checked the fuel pressure yet but i find it hard to believe that the pump could be weak if it runs so smooth but i do not know this motor as well as some of you, so any ideas would be great. Hit me back, thank for your time.