I have a 2000 GMC Sierra 1500 SLT 5.3 4WD I am needing some help. It has a hard time starting when it's warmed up. But if it sits over night it starts just fine and its runs and drives just fine but sometimes it stalls when I accelerate. Whenever I try to start it if it's hot it just turns over and over but then finally it will start but when it does start it idles real low like its fixing to die and then it will pick back up and act just fine. I know I have a fuel pressure leak but I've already replaced the fuel pump, fuel filter, plugs, plug wires, fuel injectors, fuel regulator, changed oil, and oil filter, and the air filter. I'm lost don't know what else to do. Someone please help! Thanks in advance!