In the mornings when I go to start up the truck, It turns on.. but it feels like it's about to shut off any second. The Idle drops really low, it's like i have to give it some gas for it to stay up. Driving feels fine. When i come to a stop it still feels like it's about to shut off, and the idles are still really low, and the truck lights start dimming as if it's struggling to stay on. This just started happening I noticed that it started happening as soon as the mornings got cool. After driving the truck for a while through out the day the problem goes away and no check engine light is on. Truck is a 2003 Silverado 4.8 V8 with 95k miles. any suggestions as to what could be wrong with it will be appreciated. thanks!