Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Those symptoms usually point to a weak fuel pump. First thing we need to do is measure fuel pressure, if less than 55-62 psi then we need to replace the pump. The way GM designed this truck, if fuel pressure is OK, then we're going to need a scan tool that can read engine data, not just codes, so we can look at the different sensor signals coming in in order to determine what is making the engine stall.
Please let me know what you find.