[Obysk]

This may be a security system problem.

Does the truck start up normally and then stall a second later?

Do you have a "Security" or "Theft" light that stays on (may be blinking) after the truck stalls?

If so try this, attempt to start the truck and let it stall but DO NOT turn the key back off. Instead wait to see if the security light goes out (this may take 10 minutes or so) and if it does turn the key off and then attempt another start.

Without seeing the truck or knowing exactly what is happening this is the best advice I can give right now. Try it and let us know.