gmc sonamo intermittant starting problem

sometimes truck starts and runs fine, then will start then die. wait a few hours or day and starts fine, then ok for a few days

sometimes truck starts and runs fine, then will start then die. wait a few hours or day and starts fine, then ok for a few days

Welcome to AF.
What year and engine and mileage?
Have you check the fuel pressure when it does it?
How is the tune up end?
How many miles on tune up?
Any check engine lights?
Is it losing spark or fuel pressure when it does it?

MT