what is wrong with a chevy silverado truck when:?

[Stacey H]

it doesn't seem to be getting enough gas to keep it running. we have already replaced the fuel pump, fuel filter and the throttle body cencor and a tune up.

[Stephanie C]

It may not be that it is not getting enough fuel, but it may not be getting enough air. Check to see if there is and adjustment screw to adjust the air. Check all vacuums too. Even a crack that you cannot see can cause a problem with the way it runs.

[Carrie J]

Go to an auto parts store and have them check the codes.