My truck runs for about 20-30 miles then quits. It will turn over but not start- like it is starving for gas. I wait 15 minutes then it starts. I have had 2 mechanics look at it and 2 different Dealerships. This is what has been replaced - AND I STILL HAVE THE SAME PROBLEM - (2) Fuel Pumps, Crank Shaft Sensor, Oxygen Sensor, Cam Shjaft Sensor, (2) ignition Coils, Computer was check and it was fine. PLEASE HELP!!!