starts up runs for maybe 30 seconds then dies out , any ideas . TIA

 

Did this just start happening or have you changed anything? It sounds to me like it’sPATS That’s the ANTI-THEFT system . Are you using the original key?

 

It's not PATS,

PATS will not shut off a running engine.

 

i blew a headgasket , installed new gaskets , new spark plugs , new spark plug wires , new water pump , new radiator, new gas pump , and i was driving to work when it happened truck shut off towed it home and just finished repairing everything