After the truck sets overnight and i try to start it , it will start up and immediately stop running. After a couple tries it will stay running. I had this same problem on my wife's Grand Marqui and i don't remember which part we replaced, i'm thinking it was the fuel pressure regulator but not certain. Any help is greatly appreciated. Thanks Chuck

 

Yes, you could have a faulty fp regulator. Have you checked fuel pressure?

 

i had that problem once before, my MAP (manifold absolute pressure) sensor was bad. after i replaced that it ran great again