I have a 2003 Silverado that had been running fine. Yesterday it would run for about 30 min. then die. It will start again after it sets for several hours. Runs for 30 min. then dies again. Any suggestions of what to check?

 

could be anything so you gotta start by ruling things out
put a fuel pressure gauge on it and see if the fuel pressure drop out at the 30min mark...maybe the pump gets hot and quits.

 

I was just going to post....... Found out this afternoon it is the fuel pump. But thanks anyway...... At first I thought maybe ignition control module.