Ok started the truck it will not stay running unless you keep your foot on the pedal
Battery was a little low 11.7, charged it , now I have 12.2 Alternator at 14.1
oil psi just below 80 on dash guage
Now the truck only has about 1/8 of tank of fuel

no codes
Any thoughts

 

Start with cleaning the throttle body.

 

carb cleaner or sea foam spray system cleaner[ put small hose in ]

 

I generally pull the throttle body, take the IAC out, and then clean it. Carb, or brake cleaner works fine.