I have a 2000 Silverado v8 6.0 liter 2500, the problem I have is that when I start it for the first time in the day it starts up fine. But when I go to start again it stalls before starting and will do that every time. It takes about 10-15 seconds to start but eventually it gets going. I have replaced the fuel pump and fuel filter, both of which were thought to have been the problem but as we found out, they are not. Our next best guess would be the throttle body. Has anyone else had this problem, and if so how did you fix it? Thanks.