Have 03 cummins. few days ago it began stalling after starting and driving for approximately 5 minutes. Might stall once more but then runs great. Have changed fuel and air filter. Bought fuel at a different place 3 nights ago.Anybody have any thoughts???

Got the thread moved for better exposure...

did it throw any codes when this happened?

It look like your lift pump is giving up, have your lift pump pressure check..