The dash in my truck was all cracked so I swapped it out with another one. I had to drop the steering column and pull the wiring harness out and after it was all back together the truck would fire and after a half second stall. I pulled the dash again to check the connections and for pinched wires and everything looks as it should. All my fuses are good too. Any thoughts on why it won't stay running?

 

If it ran before you did the work then it has to be something under the dash that looks good but is not making a good connection. Check all the wires and connectors again real carefully. It is probably something hard to see at first glance.

 

I talked to a guy I work with and he told me since everything was unplugged the security sistem might have lost its memory and to leave the key on for 20 minutes and it should reprogram and start

 

If it's a security issue, it won't do anything, are you getting a security light?