. I got my truck with 230k on it, first think I did was rebuilt the motor, then I did all regular maintenance( oil, diff, coolant). Then I replaced all the vacuum lines (LCE engineering sells a great kit) , you will feel a power difference...
Try adjusting the idle? When I picked up my 2nd gen from the shop that rebuilt it a few days later it did something similar. I would start it and it would idle low for a few seconds and then died, all I did was had my dad start it and give it enough throttle to stay running and I turned the idle...
