i bought an 01 silverado that has headers, vortech s/c, 3.73 gears, k&n, and diablo programmer. when i drive it for about an hour it shuts off. i can pull over and let it sit a min and then crank it up and drive it about a mile then cuts off again and will continue to do this taking longer to crank each time. after i let it sit for a day or so i can drive it for about and hour then it starts again. any suggestions? i have replaced the fuel pump and ignition switch.

 

sounds like a heat problem of some sort. something electrical getting hot and throwing in the towel until it cools off. any SES light?

 

nope no lights come on. it just shuts off with no warning until the third or fourth time then it starts surging before it dies.

 

check your fuel filter or trash in the tank

 

I'm guessing fuel problem also. Put a fuel pressure gauge to it if you can and monitor.

 

I would check the fuel pressure too.There is a chance that the fuel pump is over heating.

 

he already changed the pump.