My truck has a 5.7 v8 with a 4sp auto trans the truck stalls once it is warmed up and comes to an idle it does this a lot not everytime i drive it but a lot i have replaced the throttle position sensor the air control valve on the tbi cap rotor wires coil spark plugs fuel filter i checked the egr valve to make sure its working but i still cant figure it out any help would be appreciated thank u for your time